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Construct angle of 15 degree

Posted by Kothapalli Sudhaker 5 years, 2 months ago

1 answers

Arpan Kaur Dhillon 5 years, 2 months ago

Draw a line segment AB. Now construct an angle of 180 degree on AB. Construct an angle of 90,60and30degree. Using compass, cut an arc from 30and 0 degree. Extend a line passing from the point where the arcs intersect. The angle will be of 15degree.

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If X equal to cube root 7 + 5 root 2 minus one upon cube root 7 + 5 root 2 then find the value of x cube + 3 x minus 13

Posted by Krishnaansh Viz 5 years, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Prove that sum of all of interiors angle of triangle is 180°

Posted by Daljit Singh 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Divanshu Kansal 5 years, 2 months ago

In ∆ ABC, const. a line PQ through point A and parllel to BC. Then angle PAB + angle A + angle QAC=180° BUT angle PAB=angle B and Angle QAC=angle C [ alternative int. angle] SO, angle B + angle A + angle C = 180°

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Bhoomi Mutnale 5 years, 2 months ago

∆ABC angle A +angle B +angle C =180° (angle sum property of a triangle)

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ABC is an isosceles triangle such that BC=BD is the median to base AC then find the measure of ABD

Posted by Kewalsin Ghbhathal 5 years, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

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In triangle ABC P&Q is half if AB=BC and AP=CQ then prove that BP= BQ

Posted by Rani Sahoo 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Mudit Agarwal 5 years, 2 months ago

Proof: AB = BC AP + BP = CQ + BQ AP = CQ. (GIVEN) AP + BP = AP + BQ THEREFORE, BP=BQ HENCE PROVED

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How to understand geometry in mathematics easily

Posted by Ayush Kumar 5 years, 2 months ago

CBSE > Class 09 > Mathematics

3 answers

Bhoomi Mutnale 5 years, 2 months ago

By giving concentration towards teacher

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Kanth Varada 5 years, 2 months ago

Feel it ?

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Govind Choudhary 5 years, 2 months ago

Feel geomatry ?

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How to get better marks in this subject

Posted by Aditya Kumar 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Bhoomi Mutnale 5 years, 2 months ago

Solve more than 70 questions

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Malik Rehan Sullad 5 years, 2 months ago

Go on solving problems and practice practice

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The radii of sphere is 2r.find its volume

Posted by Tushar Bidhuri 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Yogita Ingle 5 years, 2 months ago

Volume of sphere = 4/3 π R*(3)

Here R = 2r

Volume of sphere = 4/3 π (2r)*3

Volume =( 4/3 )8π r*(3)

Volume of sphere = 32/3 π r*3

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Aditya Kumar 5 years, 2 months ago

Sometimes we afraid of these questions because of these types of data so it is very simple student radii -2r 4/3×22/7×8r^3 88/21×8r^3

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Three sides of a isosceles triangle are a,b,b. Finad the area of Triangle

Posted by Anuj Bhardwaj 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Ayah Jssu 5 years, 2 months ago

A+b+b=180 2b+a=180 A+b=90 Let a n b be x X+x=90 2x=90 X=45 A=45 B=90 B=45

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a triangle and a parallelogram have the same base and the same area.If the sides of the triangles are 15cm,14cm and 13cm and the parallelogram stands on the base 15cm. Find the height of the parallelogram.

Posted by Akshita Rawat 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Insha Naaz 5 years, 2 months ago

Let ABC and BCDE are a triangle and a parallelogram on the same base BC. For triangle ABC, a=15cm, b=14cm, c=13cm S=a+b+c÷2 =15+14+13÷2 =42÷2 =21cm Ar(ABC triangle) =√s(s-a)(s-b)(s-c) = √ 21(21-15)(21-14)(21-13) =√21×6×7×8 =√7×3×3×2×7×2×2×2 = 7×3×2×2 =84cm sq Ar (parallelogram BCDE)=84 Base× height= 84 14×height= 84 Height= 84÷28 Height=3cm sq

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A coin is tossed two times , find the probability of getting atleast one head

Posted by Adarsh Upadhysy 5 years, 2 months ago

CBSE > Class 09 > Mathematics

3 answers

Bhoomi Mutnale 5 years, 2 months ago

1/2

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Satyam Lodhi Rajput 5 years, 2 months ago

1/2

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Vikas Sharma 5 years, 2 months ago

1/2

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If x =7-4√3.find value of √x+1\√x

Posted by Ravinder Singh 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Aditya Kumar 5 years, 2 months ago

Chal hat bhutni ke rohit ravinder bhai chinta mat karo main batlata hoon iska anawer hai pehle aap root x ki taraf karo phir rhs ki taraf rhs ka postive square root kar do phir root x ka answer aapko mil jaiga phir 1/root x ka ratonalise karo usme root x ka value put kar dena ab root x ka value +1/root x kar do mera answer hai minus 2 root 4 dhanyawad

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Rohit Naagar 5 years, 2 months ago

Pata nhi

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List of area 5cm and

Posted by Arpita Gond 5 years, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

AAS congruence explanation

Posted by Sachin Hota 5 years, 2 months ago

CBSE > Class 09 > Mathematics

3 answers

Bhoomi Mutnale 5 years, 2 months ago

If two angle and one side is congruent

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Satyam Lodhi Rajput 5 years, 2 months ago

Angle side angle

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Gautam Kumar 5 years, 2 months ago

If two angles and one side of a triangle is equal to the corresponding two angles and one side then the both triangles are said to be congruent by AAS conference criteria. AAS - Two angles and any other side except the angle lying between both angle.

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Simple explanation of SAS rule and cpct

Posted by Sachin Hota 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Bhoomi Mutnale 5 years, 2 months ago

SAS→side angle side CPCT→corresponding part of congruent triangle

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Ekansh Jain 5 years, 2 months ago

The full form of CPCT is Corresponding parts of Congruent triangles. Congruency can be predicted without actually measuring the sides and angles of a triangle. If any two sides and angle included between the sides of one triangle are equivalent to the corresponding two sides and the angle between the sides of the second triangle, then the two triangles are said to be congruent by SAS rule. SAS-Congruence Of Triangles In above given figure, sides AB= PQ, AC=PR and angle between AC and AB equal to angle between PR and PQ i.e. Ð A = Ð P, hence D ABC ≅ D PQR.

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R 21, h 25 Volume of cylinder =? If π=22/7

Posted by Kajal Yadav 5 years, 2 months ago

CBSE > Class 09 > Mathematics

4 answers

Harsh Kumar 5 years, 2 months ago

34650 cm^3

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Satyam Lodhi Rajput 5 years, 2 months ago

34560

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Ekansh Jain 5 years, 2 months ago

v=πr^2 h v=22/7*21*21*25 =34650 cm^3

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Kajal Yadav 5 years, 2 months ago

2πRsq. H 2×22/7×21×21×25 22×3×21×25 34650 cm cube

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2x+y=6 2x-y=6

Posted by Matilal Nath 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Vikas Sharma 5 years, 2 months ago

Let x=3 and y=0 (2×3)+0 6+0=6 And (2×3)–0 6–0=6 hence prooved

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Factorise x^4 + 4

Posted by Priyanshu Yadav 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Anshu Singh 5 years, 2 months ago

(x^4+4x^2+4)-4x^2 (x^2+2)^2-(2x)^2 (x^2+2-2x)(x^2+2+2x)

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x^3-x^3=

Posted by Mehak ❤️ 5 years, 2 months ago

CBSE > Class 09 > Mathematics

3 answers

Anmol Bedi 5 years, 2 months ago

0❤️❤️

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Vikas Sharma 5 years, 2 months ago

(×–y) (x^2+xy+y^2)

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Mr. X 5 years, 2 months ago

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1 is prime number or not?

Posted by Anurag Singh ?? 5 years, 2 months ago

CBSE > Class 09 > Mathematics

5 answers

Bhoomi Mutnale 5 years, 2 months ago

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Vikas Sharma 5 years, 2 months ago

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Shubham Meena 5 years, 2 months ago

1 is not a prime no. because it has only one factor

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Kajal Yadav 5 years, 2 months ago

1 is neither prime and nor composite

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Diya Tomar 5 years, 2 months ago

No 1 is not a prime number because prime number are those number that have only two factor 1 and number itself but 1 does not two factors

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Formula of mean

Posted by Vinod Sheoran 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Vikas Sharma 5 years, 2 months ago

Mean =sum of all observations/ total number of observations

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Vinod Sheoran 5 years, 2 months ago

Tgyfd

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M²-7m-30 factorise

Posted by Bhawna Yadav 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 5 years, 2 months ago

m²-7m-30

= m² - 10m + 3m - 30

= m(m - 10) + 3 (m - 10)

= (m -10) (m + 3)

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Sides of atriangle a, b, c. If s-a=4cm, s-b=8, s-c=12 then find the value of a, b, c.

Posted by Jyoti Bondu 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Vikas Sharma 5 years, 2 months ago

Value of a = 20 , b = 16 and c =12.

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Gaurav Seth 5 years, 2 months ago

If a, b, c are sides of triangle then
s=(a+b+c)/2
Given:

s-a=4 cm

s-b=8 cm

s-c=12 cm

Adding these we get

s+s+s-a-b-c = 24

3s-(a+b+c) =24

3s-2s = 24

s = 24

Now,

s-a=4

24 - a =4

a = 24 - 4 = 20 cm

s-b=8

24 - b = 8

b = 24 - 8 = 16 cm

s - c = 12

24 - c = 12

c = 24 -12 = 12 cm

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If the sum of a pair of opposite angels of a quadrilateral is 180; the quadrilateral is cyclic

Posted by Mohan Ray 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 2 months ago

Given the sum of pair of opposite angles of a quadrilateral is 180° we have to prove that the quadrilateral is cyclic.

Let us assume that the quadrilateral ABCD is not cyclic i.e Let the point D does not lie on the circle which makes the quadrilateral non-cyclic. Now, let us do a construction such that join CD' where D' is the point of intersection of side AD with the circle.

Now, ABCD' is cyclic

⇒ ∠3 + ∠4 = 180°

Now, it is given that the sum of pair opposite angles of a quadrilateral ABCD is 180°

Therefore, ∠2 + ∠4 = 180°

From above two equations we get

∠3 + ∠4 = ∠2 + ∠4

⇒ ∠3 = ∠2

Now, in triangle CDD', by external angle property

∠3 = ∠1 + ∠2

⇒ ∠1 = 0 , hence the side CD' and CD coincides

⇒ Point D lies on circle

Hence, our supposition is wrong quadrilateral ABCD is cyclic.

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Volume is 179 whole 2 upon 3 cm cube find the surface area of a sphere whose volume is 179 2 upon 3 centimetre cube

Posted by Priyanshu Verma 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 2 months ago

Given -

V = 179 2/3 cu.cm = 179.67 cu.cm

Now,

Volume of sphere is given by formula -

V = 4/3 πr^3

179.67 = 4/3 × 3.142 × r^3

r^3 = 179.67 / 4.189

r^3 = 42.89

r = 3.5 cm

Now, surcace area of sphere is given by -

A = 4πr^2

A = 4 × 3.142 × 3.5^2

A = 154 sq.cm

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What is the difference between statics and probability

Posted by Divyansh Verma 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Anjali Pathak 5 years, 2 months ago

Probability: The numerical measure of uncertainty is called probability. Statics: It is a branch of mathematics which deals with collections presentation, analysis, interpretation and synthesis and drawing of interfrances.

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Midtarm examination 2019-20

Posted by Vikash Ojha 5 years, 2 months ago

CBSE > Class 09 > Mathematics