CBSE > Class 09 > Mathematics | CBSE Board | Homework Help

It is given that, EB {tex}\parallel{/tex} DL and ED {tex}\parallel{/tex} BL. Therefore, EBLD is a parallelogram.
{tex}\triangle{/tex}DCL {tex}\cong{/tex} {tex}\triangle{/tex}FBL
{tex}\Rightarrow{/tex} DC = BF and DL = FL
Now, BE = DC = AB
{tex}\Rightarrow{/tex} 2AB = 2DC {tex}\Rightarrow{/tex} AF = 2DC
Hence proved.
Since DL = FL (proved above)
{tex}\Rightarrow{/tex} DF = 2DL

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Ranveer Singh 5 years, 1 month ago

Bakwas

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ANSWER

What is the formulla for area of rhombus

Posted by Abdul Rahim 5 years, 1 month ago

CBSE > Class 09 > Mathematics

4 answers

Aarav Nirwal 5 years, 1 month ago

1/2 ×d1×d2

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Suman Kumar 5 years, 1 month ago

L*b. If diagonal is given then area =1/2*d1*d2

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Rakshit Goel 5 years, 1 month ago

((Diagonal 1)(diagonal2))/2

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Saniya Sheikh 5 years, 1 month ago

Area of a rhombus=1/2(d1+d2)xh Perimeter of rhombus=4a

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ANSWER

Find the series whose nth term is 3 ratio to the power n minus 1

Posted by Taniya Singla 5 years, 1 month ago

CBSE > Class 09 > Mathematics

1 answers

Kavya Agrawal 5 years, 1 month ago

n = 3^n - 1 2, 8, 26, 80 … OR n = 3^(n-1) 1, 3, 9, 27, 81 ...

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ANSWER

24×57×44+634÷567+4567÷358×24558=?

Posted by Mirza Ayan 5 years, 1 month ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

What is the formula of trapezium

Posted by Mirza Ayan 5 years, 1 month ago

CBSE > Class 09 > Mathematics

3 answers

Kddh Hgj 5 years, 1 month ago

1/2×(sum of parallel side)×height

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Ayush Kumar ? 5 years, 1 month ago

1/2 ×(a+b)+heigjt

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Lakshmi Karamannaanvar 5 years, 1 month ago

1/2 × sum of parallel sides × height=1/2 (a+b) × h

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ANSWER

Probability of any event E, always lies between 0 and 1.

Posted by Dakshita Dharwal 5 years, 1 month ago

CBSE > Class 09 > Mathematics

1 answers

Seema Devi 5 years, 1 month ago

Yes

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ANSWER

A number is irrational if its decimal representation is: 1-Non- terminating 2- Non- terminating recurring 3-Non- terminating non- recurring

Posted by Dakshita Dharwal 5 years, 1 month ago

CBSE > Class 09 > Mathematics

1 answers

Krishna Upadhyay 5 years, 1 month ago

3-non-terminating non-recurring

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ANSWER

(5+√7)(2+√5) simplify the expression

Posted by Kunj Patel 5 years, 1 month ago

CBSE > Class 09 > Mathematics

4 answers

Utkarsh Aryan 5 years, 1 month ago

5(2+√5)+√7(2+√5) =10+5√5+2√7+√35

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Mohit Gupta 5 years, 1 month ago

=5(2+√5)+√7(2+√5) =10+5√5+2√7+√35 Ans

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Piyush Raj 5 years, 1 month ago

17+7√7

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Piyush Raj 5 years, 1 month ago

(5+√7)(2+√7) =5(2+√7)+√7(2+√7) =10+5√7+2√7+7 =10+7√7+7

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ANSWER

Q.1. (8+3√21)⅓ + (8-3√21)⅓ = ?

Posted by Ankit Raj 5 years, 1 month ago

CBSE > Class 09 > Mathematics

2 answers

Karan Kushwah 5 years, 1 month ago

Formula (a+b)(a-b) =a Square -b square Then, 8square -3√21square = 64-3*3=64-9=55

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Bro . 5 years, 1 month ago

(8⅓+3×21½×⅓)+ (8⅓-3×21½×⅓). (2+21^1/6)+(2-21^1/6). 2+21^1/6+2-21^1/6. 2+2. 4

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ANSWER

Locate root 9 in number line

Posted by Raj Chauhan 5 years, 1 month ago

CBSE > Class 09 > Mathematics

1 answers

Shivam Pal 5 years, 1 month ago

Root 9 =3 And you can easily locate that on no line

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Application questions for heron's formula

Posted by Anzil Muhammed 5 years, 1 month ago

CBSE > Class 09 > Mathematics

1 answers

Piyush Raj 5 years, 1 month ago

The area of a triangle is 750cm² and the sides are in ratio 5:12:13.what is the perimeter of the triangle.

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ANSWER

Show that x-5 is a factor of x cube - 3 x square -4x -30

Posted by Kusum Lata 5 years, 1 month ago

CBSE > Class 09 > Mathematics

1 answers

Naveendeep G N 5 years, 1 month ago

G(x)=x-5 P(x)=x³- 3x²- 4x- 30 =(5)³ - 3(5)² - 4(5) -30 =125- 75- 20 -30 = 125- 75- 50 =125- 125 O =O Therefore, x-5 is factor of x³- 3x²- 4x- 30

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ANSWER

Construct a triangle ABCin which BC=7cm, angle B=75 and AB+AC=13cm

Posted by Bindu Tr 5 years, 1 month ago

CBSE > Class 09 > Mathematics

2 answers

Bindu Tr 5 years, 1 month ago

Thc

1Thank You

Gaurav Seth 5 years, 1 month ago

Given : Base BC = 7cm, angle B = 75° and sum of two sides AB + AC = 13 cm.

Required : To Construct ∆ABC

STEPS OF CONSTRUCTION :

1. Draw a ray BX and cut off a line segment BC = 7cm; from it.

2. At B; construct angle YBX = 75°

3. With B as centre and radius = 13 cm (because AB + AC = 13cm) draw an arc to meet BY at D.

4. Join CD

5. Draw Perpendicular bisector PQ of CD intersecting BD at A.

6. Join AC

Then ABC is the required triangle.

A lies on perpendicular bisector of CD.

Therefore, AC = AD

=> AB = BD - AD

=> AB = BD - AC

=> AB + AC = BD = 13cm

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ANSWER

In which quadrants ycoordinates are negative

Posted by Jyoti Bali 5 years, 1 month ago

CBSE > Class 09 > Mathematics

3 answers

Karan Kushwah 5 years, 1 month ago

3and 4

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Vanshikka Singh???? 5 years, 1 month ago

3rd and 4th

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Shivam Pal 5 years, 1 month ago

In 3rd and 4th coordinares are negative

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ANSWER

(249)square-(248)square will be

Posted by Jyoti Bali 5 years, 1 month ago

CBSE > Class 09 > Mathematics

5 answers

Bro . 5 years, 1 month ago

249²-248². 249+248. 497.ans

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Karan Kushwah 5 years, 1 month ago

1*497=497

1Thank You

Yuraj Sarraf 5 years, 1 month ago

(249)square-(248)square (249-248)(249+248) 1*497 =497

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Harsh Mishra 5 years, 1 month ago

So, What is the Right Question ????

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Jyoti Bali 5 years, 1 month ago

I am sorry but question is wrong

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ANSWER

If one side of an equilateral triangle is 4 cm .find area

Posted by Sakshi Swarnkar 5 years, 1 month ago

CBSE > Class 09 > Mathematics

4 answers

Bro . 5 years, 1 month ago

s=4+4+4/2. s=12/2. s=6. Area=√(6-4)×(6-4)×(6-4). Area=√2×2×2. Area=√8. Area=2√2.ans

1Thank You

Ashvanth Gopal 5 years, 1 month ago

In a eqalateral triangle all sides are equal so sidea=b=c=4cm by heron's formula you can find the semiperimeter and after that find the area

2Thank You

Diya Save 5 years, 1 month ago

as it is an equilateral triangle hence,side1=side2=side3 area of equiateral triangle =root3 * (side)^2 --------- 4 =root3 * (4)^2 ------------ 4 = root3 * 16 ---------- 4 = root 3 * 4 =4 *root 3

1Thank You

Kabir Arora 5 years, 1 month ago

512 cm^2

4Thank You

ANSWER

5+3×5

Posted by Aalok Aryan Ś 5 years, 1 month ago

CBSE > Class 09 > Mathematics

10 answers

Bro . 5 years, 1 month ago

The answer is 20.

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Karan Kushwah 5 years, 1 month ago

0Thank You

Abdul Miqaeel Mulla 5 years, 1 month ago

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Jyoti Bali 5 years, 1 month ago

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Vivek Dhote 5 years, 1 month ago

0Thank You

Ankur Chauhan 5 years, 1 month ago

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Shweta Shukla 5 years, 1 month ago

20 according to bodmass

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Mukul Kumar 5 years, 1 month ago

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Renjith Mr 5 years, 1 month ago

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A A 5 years, 1 month ago

20 according to bodmas rule

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ANSWER

3x+5y=7.5

Posted by Ãßhîshék Kumar 5 years, 1 month ago

CBSE > Class 09 > Mathematics

1 answers

Renjith Mr 5 years, 1 month ago

x=2.5, y=0 That is, 3×2.5+5×0=7.5

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ANSWER

According to cbse what is portfolio which is internal syllabus of class 9

Posted by Shani Pandey 5 years, 1 month ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Pi is an which number

Posted by Vattal Chary 5 years, 1 month ago

CBSE > Class 09 > Mathematics

2 answers

Jyoti Bali 5 years, 1 month ago

Irrational number

0Thank You

Gaurav Seth 5 years, 1 month ago

irrational number

Pi is a name given to the ratio of the circumference of a circle to the diameter. That means, for any circle, you can divide the circumference (the distance around the circle) by the diameter and always get exactly the same number. It doesn't matter how big or small the circle is, Pi remains the same. Pi is often written using the symbol and is pronounced "pie", just like the dessert.

Pi was irrational, that is, that it can't be written as a ratio of integer numbers.

Because Pi is known to be an irrational number it means that the digits never end or repeat in any known way.

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ANSWER

Is zero a rational number can we write in form of p/q

Posted by Adarsh Chaurasia 5 years, 1 month ago

CBSE > Class 09 > Mathematics

6 answers

Vanshikka Singh???? 5 years, 1 month ago

Yes ofcourse

0Thank You

Nihal Kumar 5 years, 1 month ago

yes, we can write 0 in the form of P/q such as 0/1, 0/2, 0/3 etc.

1Thank You

Harsh Mishra 5 years, 1 month ago

Yes, 0 is a rational number (provided that you understand 0 as the symbol of the natural or integer number zero). The definition of a rational number is 'A number that can be written in the form a/b, where a and b are integers with no common factors and b is NOT zero'. 0 can be written as (for example) 0/2......

Well, Frankly saying I'm not sure about it as some says that It Is!!! & Some says It Isn't!!! I don't know what's given in the Book..... But!!! I think so that It Is.....Rational Number.

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Shani Pandey 5 years, 1 month ago

Yes,for example 0/1 it is a rational no.

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Amayra 1111 5 years, 1 month ago

Yes

1Thank You

Shivam Pal 5 years, 1 month ago

0 can't be ratinal no if you divide any no with 0 it be 0 it can't be 0/1 or 0/2

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ANSWER

74.22divide 23