CBSE > Class 10 | CBSE Board | Homework Help

Solution: Given:- AB।। EF To prove:- AE/ED = BF/FC Construction:- draw AC Now in ∆ ADC , EP ll DC By basic proportionally theorem AE/ED = AP/PC ------- (1) Similarly in ∆ ABC AP/PC = BF/ FC --------- (2) From equ. (1) and (2) AE/ED = BF/FC Hence proved

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If the mean of 5 observations X,X+2,X+4,X+6,X+8 is 11 , find the value of X

Posted by Princy Singh 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Simranpreet Kaur 5 years, 2 months ago

(X+X+2+X+4+X+6+X+8)/5=11 (5X+20)/5=11 5X+20=11×5 5X=55-20 5X=35 X=35/5 X=7

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Find HCF of 246

Posted by Harleen Kaur 5 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Maniya Jain 5 years, 2 months ago

246÷2=123÷3=41÷41=1

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Amit Bhadouriya 5 years, 2 months ago

246÷2=123÷3=41÷41=1

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Princy Singh 5 years, 2 months ago

246÷2=123÷3=41÷41=1

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*Tsunami-The killer sea waves* koi help kr do plz... Mujhe es topic pe project bnana hai... Plz... Deel kr do ye topic... ???

Posted by Swarnima Verma 5 years, 2 months ago

CBSE > Class 10 > Social Science

2 answers

Simran Shira 5 years, 2 months ago

See this link

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Simran Shira 5 years, 2 months ago

https://youtu.be/oS6nLijKrl8

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Write a note of Greece war of independence

Posted by Tanu Sri 5 years, 2 months ago

CBSE > Class 10 > Social Science

2 answers

Maniya Jain 5 years, 2 months ago

Greece had been part of the Ottoman Empire since the fifteenth century. • The growth of revolutionary nationalism in Europe sparked off a struggle for independence amongst the Greeks which began in 1821. • Nationalists in Greece got support from other Greeks living in exile and also from many West Europeans who had sympathies for ancient Greek culture. • Poets and artists lauded Greece as the cradle of European civilisation and mobilised public opinion to support its struggle against a Muslim empire. • The English poet Lord Byron organised funds and later went to fight in the war, where he died of fever in 1824. • Finally, the Treaty of Constantinople of 1832 recognised Greece as an independent nation.

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Tanu Sri 5 years, 2 months ago

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Sin x=cos x find the value of x

Posted by Shalu P P 5 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

B.Aishwarya 203 Kalyannagar 5 years, 2 months ago

45 degrees

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Aashvi Singh 5 years, 2 months ago

Sin x =cos x(as given) =>We can write sin x as cos (90-x) =cosx =>now ,cos from both the sides will b canceled and you would be getting as (90-x) =x =>on solving, 90=x+x 90=2x 90/2=x 45=x Hence your answer is x=45

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Madhura Dighikar 5 years, 2 months ago

X=45°

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Building of big dams gives rise to some problems . List 3 main problems that may arise suggest a solution to any one of these problems

Posted by Monishka Mali 5 years, 2 months ago

CBSE > Class 10 > Science

2 answers

Karan Gupta 5 years, 2 months ago

Itni padhai ??

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Yogita Ingle 5 years, 2 months ago

Social problems
Economic problems
Environmental problems.
Solution to these problems would be adequate rehabilitation, compensation to the displaced persons and afforestation.

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what is communication

Posted by Ayush Yadav 5 years, 2 months ago

CBSE > Class 10 > Information Technology (402)

1 answers

Yogita Ingle 5 years, 2 months ago

Communication is a process that involves sending and receiving of messages through a verbal and non-verbal method. The sender sends a message, the receiver receives a message and sends it back with the feedback to the sender again.

The methods of communication involve oral and speech communication, written and graphical representations. Additionally, it includes the cultural sphere, a tool utilized to communicate, location, etc. Though it looks simple, communication is generally a very complicated subject.

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9.1 2nd questions

Posted by Harshit Yadav Harshit Yadav 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years, 2 months ago

2. A tree breaks due to storm and the broken part bends so that the top of the tree touches the ground making an angle 30° with it. The distance between the foot of the tree to the point where the top touches the ground is 8 m. Find the height of the tree.

Solution:

Using given instructions, draw a figure. Let AC be the broken part of the tree. Angle C = 30°

BC = 8 m

To Find: Height of the tree, which is AB

From figure: Total height of the tree is the sum of AB and AC i.e. AB+AC

In right ΔABC,

Using Cosine and tangent angles,

cos 30° = BC/AC

We know that, cos 30° = √3/2

√3/2 = 8/AC

AC = 16/√3 …(1)

Also,

tan 30° = AB/BC

1/√3 = AB/8

AB = 8/√3 ….(2)

Therefore, total height of the tree = AB + AC = 16/√3 + 8/√3 = 24/√3 = 8√3 m.

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Give a reply to the question asked fast to us

Posted by Suresh Gupta 5 years, 2 months ago

CBSE > Class 10 > Social Science

1 answers

Gaurav Seth 5 years, 2 months ago

Steps which can be taken to prevent environmental degradation area are as follows:

a) Proper planning should be done while deciding the location of industries, better design and efficient use of the equipment.
b) Various equipment such as filters, precipitators, and scrubbers should be used in industries to control pollution.
c) Water pollution can be controlled by treating polluted water before discharge from the industries.

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Explain the measures taken by the government to control environmental degradation

Posted by Suresh Gupta 5 years, 2 months ago

CBSE > Class 10 > Social Science

1 answers

Gaurav Seth 5 years, 2 months ago

Steps which can be taken to prevent environmental degradation area are as follows:

a) Proper planning should be done while deciding the location of industries, better design and efficient use of the equipment.
b) Various equipment such as filters, precipitators, and scrubbers should be used in industries to control pollution.
c) Water pollution can be controlled by treating polluted water before discharge from the industries.

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The decimal representation of 14587/2power1×5power4 will terminate after how many decimal places

Posted by Saranam Naga Dhathri 5 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Tanya Dhama 5 years, 2 months ago

After 4decimal places

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Sushruth H 5 years, 2 months ago

14587/2×5⁴ =14587×2³/2×5⁴×2³ =116696/10⁴ =116696/10000 =11.6696 (It will terminate after 4 decimal places)

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Sushruth H 5 years, 2 months ago

=14587/2²×5⁴ =14587×2²/2²×5⁴×2² =58348/10⁴ =58348/10000 =5.8348 (It will terminate after 4 decimal places)

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Indo - Gangetic plains have a high density of population . Find the reasons

Posted by Mandaloju Smiley 5 years, 2 months ago

CBSE > Class 10 > Social Science

1 answers

Gaurav Seth 5 years, 2 months ago

Indo-Gangetic plains are the most populated region of India. There are many factors responsible for it, they are –

a. Perennial supply of water- Availability of water throughout the year make agricultural activities possible all through the year and more than one crop cycle in a year possible to support the population.

b. A strong network of road and rail - Gangetic plains have a strong network of road and rail network that connect it to all the parts of the country. The comparatively flat surface of the Indo-Gangetic plains provides the ideal conditions to construct roads and lay railway lines.

c. Many agro-based industries are located in this region. Providing work to the people and attracting people from other parts in the region.

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4) If A and B are (-2, -2) and (2, -4) respectively. Find the coordinates of P such that AP = 3/7 AB and P lies on the line segment AB.

Posted by Tharun Vinayagam 5 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

'guns could be bought or captured turned against the invaders .But not diseases such as smallpox to which conqueror were mostly immune 'explain?

Posted by Sonila Bhutia 5 years, 2 months ago

CBSE > Class 10 > Social Science

1 answers

Gaurav Seth 5 years, 2 months ago

The Portuguese and Spanish conquest and colonisation of America was decisively under way by the mid-sixteenth century.

(i)In fact, the most powerful weapon of the Spanish conquerors was not a conventional military weapon at all. It was the germs such as those of smallpox that they carried on their person.

(ii)Because of their long isolation, America’s original inhabitants had no immunity against these diseases that came from Europe.

(iii)Smallpox in particular proved a deadly killer.Once introduced, it spread deep into the continent, ahead even of any Europeans reaching there

(iv)It killed and decimated whole communities, paving the way for conquest.

(v)Guns could be bought or captured and turned against the invaders. But not diseases such as smallpox to which the conquerors were mostly immune.

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What were political conditions in Europe in mid 18th century

Posted by Garv Bansal 5 years, 2 months ago

CBSE > Class 10 > Social Science

3 answers

Tejasvini S 5 years, 2 months ago

(i) The first half of the nineteenth century saw an enormous increase in population all over Europe. (ii) In most countries, there were more job seekers than employment. Population from rural areas migrated to the cities to live in overcrowded slums. (iii) Small producers in towns were often faced with stiff competition from imports of cheap machine made goods from England, where industrialisation was more advanced than on the continent. (iv) In these regions of Europe where the aristocracy still enjoyed power, peasants struggled under the burden of feudal dues and obligations. (v) The rise of food prices or a year of bad harvest led to widespread pauperism in town and country.

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Yogita Ingle 5 years, 2 months ago

The political conditions of Europe as follows :
(i) The first half of the nineteenth century saw an enormous increase in population all over Europe.
(ii) In most countries, there were more job seekers than employment. Population from rural areas migrated to the cities to live in overcrowded slums.
(iii) Small producers in towns were often faced with stiff competition from imports of cheap machine made goods from England, where industrialisation was more advanced than on the continent.
(iv) In these regions of Europe where the aristocracy still enjoyed power, peasants struggled under the burden of feudal dues and obligations.
(v) The rise of food prices or a year of bad harvest led to widespread pauperism in town and country.

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Sonila Bhutia 5 years, 2 months ago

European countries saw many of the revolution during mid of the 18th century some of the revolution are Napoleonic ware, Romanticism etc. In 18th century also witnessed the feeling of nationalism when French revolution started .The idea such as liberty, equality arose among the people and they want to end the dictatorship in oder to established Independent nation .

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If xy=180 and HCF xy=3,then find the LCM(x,y)

Posted by Saranam Naga Dhathri 5 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Ekta Sirohi 5 years, 2 months ago

LCM =60

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Parul Ailawadi 5 years, 2 months ago

LCM×HCF=Product of two numbers LCM×3=180 LCM=180÷3 LCM=60

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Anuj Mathpal 5 years, 2 months ago

LCM =180/3 LCM=60

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Exercise 3.4 questions 2ka 4

Posted by Gourav Richa Richa 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years, 2 months ago

(iv) Meena went to a bank to withdraw Rs.2000. She asked the cashier to give her Rs.50 and Rs.100 notes only. Meena got 25 notes in all. Find how many notes of Rs.50 and Rs.100 she received.

Solution:

Let the number of Rs.50 notes be A and the number of Rs.100 notes be B

According to the given information,

A + B = 25 ……………………………………………………………………….. (i)

50A + 100B = 2000 ………………………………………………………………(ii)

When equation (i) is multiplied with (ii) we get,

50A + 50B = 1250 …………………………………………………………………..(iii)

Subtracting the equation (iii) from the equation (ii) we get,

50B = 750

B = 15

Substituting in the equation (i) we get,

A = 10

Hence, Manna has 10 notes of Rs.50 and 15 notes of Rs.100.

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Exercise 4.3 ka first question

Posted by Jayank Mishra 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years, 2 months ago

1. Find the roots of the following quadratic equations, if they exist, by the method of completing the square:

(i) 2x² – 7x +3 = 0

(ii) 2x² + x – 4 = 0
(iii) 4x² + 4√3x + 3 = 0

(iv) 2x² + x + 4 = 0

Solutions:

(i) 2x² – 7x + 3 = 0

⇒ 2x² – 7x = – 3

Dividing by 2 on both sides, we get

⇒ x² -7x/2 = -3/2

⇒ x²-2 × x ×7/4 = -3/2

On adding (7/4)² to both sides of equation, we get

⇒ (x)²-2×x×7/4 +(7/4)² = (7/4)²-3/2

⇒ (x-7/4)² = (49/16) – (3/2)

⇒(x-7/4)²= 25/16

⇒(x-7/4)² = ±5/4

⇒ x = 7/4 ± 5/4

⇒ x = 7/4 + 5/4 or x = 7/4 – 5/4

⇒ x = 12/4 or x = 2/4

⇒ x = 3 or x = 1/2

(ii) 2x² + x – 4 = 0

⇒ 2x² + x = 4

Dividing both sides of the equation by 2, we get

⇒ x² +x/2 = 2

Now on adding (1/4)²to both sides of the equation, we get,

⇒ (x)²+ 2 × x × 1/4 + (1/4)² = 2 + (1/4)²

⇒ (x + 1/4)² = 33/16

⇒ x + 1/4 = ± √33/4

⇒ x = ± √33/4 – 1/4

⇒ x = ± √33-1/4

Therefore, either x = √33-1/4 or x = -√33-1/4

(iii) 4x² + 4√3x + 3 = 0

Converting the equation into a²+2ab+b²form, we get,

⇒ (2x)² + 2 × 2x × √3 + (√3)² = 0

⇒ (2x + √3)² = 0

⇒ (2x + √3) = 0 and (2x + √3) = 0

Therefore, either x = -√3/2 or x = -√3/2.

(iv) 2x² + x + 4 = 0

⇒ 2x² + x = -4

Dividing both sides of the equation by 2, we get

⇒ x² + 1/2x = 2

⇒ x² + 2 × x × 1/4 = -2

By adding (1/4)²to both sides of the equation, we get

⇒ (x)²+ 2 × x × 1/4 + (1/4)² = (1/4)²– 2

⇒ (x + 1/4)² = 1/16 – 2

⇒ (x + 1/4)² = -31/16

As we know, the square of numbers cannot be negative.

Therefore, there is no real root for the given equation, 2x² + x + 4 = 0.

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What is oxidising agent and reducing agent ?

Posted by Sushant Sharma 5 years, 2 months ago

CBSE > Class 10 > Science

4 answers

Ritika Talwar 5 years, 2 months ago

An oxidising agent is an agent which oxidises other element and itself gets reduced. A reducing agent is an agent which itself gets oxidised and reduces other elements.

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Sushant Sharma 5 years, 2 months ago

Thanx

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Parul Ailawadi 5 years, 2 months ago

An reducing agent is a substance that oxidize itself to reduce the other substance. An oxidizing agent is a substance that reduce itself to oxidize the other substance.

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Chahit Insan 5 years, 2 months ago

An oxidizing agent reduce itself to oxidise the other substance

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If anyone downloaded this app then answer my question..... ✨how can we make a presentation in ms powerpoint....?your time starts 1:50 to 2:30 give me the answer of this question....

Posted by Itachi Uchiha ? 5 years, 2 months ago

CBSE > Class 10 > Information Technology (402)

4 answers

A N Rahul 5 years, 2 months ago

It is simple. Open PowerPoint. Click on new if u use 0ffice 19/16/365 Click on file and then new if u use previous versions of office. You can change slide designs in design tab.

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Itachi Uchiha ? 5 years, 2 months ago

Kaise bnate h presentation..

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Itachi Uchiha ? 5 years, 2 months ago

Easy h to answer do

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Adarsh Vishwakarma 5 years, 2 months ago

very easy

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ANSWER

If u all have computer system ,or laptop so it is all write if no ,then download microsoft word, microsoft excel, microsoft powerpoint presentation......(wale app). Then u have to see all the functions are available in your phone for making you to perfect study for IT SUBJECT...then now I give some practical work and do it yourself and then I put some questions from it then u have to answer these questions ,, this all is happening for increasing your IT knowledge..

Posted by Itachi Uchiha ? 5 years, 2 months ago

CBSE > Class 10 > Information Technology (402)

1 answers

A N Rahul 5 years, 2 months ago

Instead of installing all apps one by one, just install office 16/19/365 iso files, mount it and use the setup. You can easily activate it by the use of youtube as there are some command prompt tricks.

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Bad apppppppp....because it does not answer my queries

Posted by Tanisha . 5 years, 2 months ago

CBSE > Class 10 > Science

4 answers

Malaika Sharma 5 years, 1 month ago

What's your question???

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Itachi Uchiha ? 5 years, 2 months ago

Palak can u answer MY question

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Palak ? 5 years, 2 months ago

Yes tanu, tell which question u r asking I will also try to answer ur question.... My cousin name is also tanishka her pet name is tanu

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Itachi Uchiha ? 5 years, 2 months ago

Tanisha what is your question..can u tell me again I hope can give you your questions answer...plzz tell me your question what is ur question?

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What is the advantage of linking workbooks ?

Posted by Susmeet Singh 5 years, 2 months ago

CBSE > Class 10 > Information Technology (402)

1 answers

Yogita Ingle 5 years, 2 months ago

The advantage to linking the worksheet is that if the source worksheet in Excel changes, the values are automatically updated in the Word document. If you make a change in the numbers, text, formatting, or formulas, the document will reflect those changes immediately.

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माता का अंचल' पाठ में लेखक का माता-पिता से बहुत लगाव है ।माता-पिता भी उनका बहुत ध्यान रखते हैं आपके विचार से माता -पिता के प्रति हमारे क्या-क्या कर्तव्य होने चाहिए ?

Posted by Taniya 5 years, 2 months ago

CBSE > Class 10 > हिंदी ए

2 answers

Student Inquisitive 5 years, 1 month ago

माता- पिता का हमारे जीवन में बहुत बड़ा हाथ होता है। उनके समर्थन से हम अपने जीवन के ऊंचे शिखर को प्राप्त कर सकते है। माता यदि त्यागमूर्ति है तो वहीं पिता हमारे परेशानियों को दूर करने वाले। इस प्रकार से हमारा भी अपने माता पिता के प्रति कर्तव्य बनता है कि उनका हमारे लिए जो प्रीति, लाड प्यार, वात्सल्यता है उसे आदर दें। तथा उनका सदैव सम्मान करें। कोई ऐसा कार्य न हो जिससे उनकी भावनाओं को ठेस पहुंचे।

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Taniya 5 years, 2 months ago

Please answer ???

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Given the HCF (306, 657) = 9, find LCM (306, 657)

Posted by Om Shukla 5 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Parul Ailawadi 5 years, 2 months ago

LCM×HCF=Product of two numbers LCM×9=306×657 LCM×9=201042 LCM=201042÷9 LCM=22338

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Anuj Mathpal 5 years, 2 months ago

Let the LCM = x. HCF *LCM =Product of two numbers. 9*x=306*657 x=306*657/9 x=34*657 x=22,338

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What is a shortcut menu?What is its significance

Posted by Naman Mittal 5 years, 2 months ago

CBSE > Class 10 > Information Technology (402)

1 answers

Itachi Uchiha ? 5 years, 2 months ago

A shortcut menu is a menu that shows the most frequently used commands for a selected item (file, folder or anything else). It is also called context-sensitive menu. The shortcut menu is useful in the sense that all related commands are available at one platform without having to go here and there....hope this is helpful for you...

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Prove that the range ts drawn at the ends of a diameter of a circle are parallel

Posted by Ryan George 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years, 1 month ago

Let AB be a diameter of the circle. Two tangents PQ and RS are drawn at points A and B respectively.

Radius drawn to these tangents will be perpendicular to the tangents.

Thus, OA ⊥ RS and OB ⊥ PQ

∠OAR = 90º

∠OAS = 90º

∠OBP = 90º

∠OBQ = 90º

It can be observed that

∠OAR = ∠OBQ (Alternate interior angles)

∠OAS = ∠OBP (Alternate interior angles)

Since alternate interior angles are equal, lines PQ and RS will be parallel.

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ANSWER

Find the coordinate of the point which divides the join of (-1, 7) and (4, -3) in the ratio 2:3

Posted by Md Shahid Afridi 5 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Sourav Keshri 5 years, 2 months ago

A=(-1, 7) B=(4, -3) Ratio=2:3 Let the coordinate point P(x, y) P(x, y) =(m1x2+m2x1/m1+m2, m1y2+m2y1/m1+m2) P(x, y) ={2×4+3×(-1) /2+3, 2×(-3) +3×7/2+3} P(x, y) =(8-3/5, -6+21/5) P(x, y) =(5/5,15/5) P(x, y) =(1, 3) Hence, coordinate point are P(1, 3)

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Parul . 5 years, 2 months ago

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A K47 5 years, 2 months ago

(1,3) is the dividing point

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