CBSE > Class 07 > Mathematics | CBSE Board | Homework Help

Given : A triangle ABC. To prove : ∠A+∠B+∠C=180 o ⟹∠1+∠2+∠3=180 o Construction : Through A, draw a line l parallel to BC. Proof : Since l∥BC. Therefore, ∠2=∠4 .......eq(i) And, ∠3=∠5......eq(ii) adding eq(i)and(ii) Therefore, ∠2+∠3=∠4+∠5 ∠1+∠2+∠3=∠1+∠4+∠5 [adding∠1bothSide] ∠1+∠2+∠3=180 o Thus, the sum of three angles of a triangle is 180 o .

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Identify which of the following pairs of angles complementary. [a] 65 ̊, 115 ̊ [b] 130 ,̊ 50 ̊ [c] 63 ,̊ 27 ̊ [d] 112 ̊, 68 ̊

Posted by Abhishek Taily 3 years, 5 months ago

CBSE > Class 07 > Mathematics

1 answers

Preeti Dabral 3 years, 5 months ago

63 ,̊ 27 ̊

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Up coming test when mam

Posted by 5541426 Manish.Cheekati 3 years, 5 months ago

CBSE > Class 07 > Mathematics

1 answers

Kt Tiwari 3 years, 5 months ago

What is meaning of water

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Graphical representation of the types of houses of bihar

Posted by Angel Sarkar 3 years, 5 months ago

CBSE > Class 07 > Mathematics

1 answers

Jass Kaur 3 years, 5 months ago

This is maths section not your this bihar section

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Simplify (-4)3 ÷(-4)8

Posted by Insha Naseer 3 years, 5 months ago

CBSE > Class 07 > Mathematics

2 answers

Gayathri R 3 years, 5 months ago

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Sunita Bindi 3 years, 5 months ago

213+321

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5/9×-4/7÷8/27×-3/4

Posted by Karishma Arora 3 years, 5 months ago

CBSE > Class 07 > Mathematics

2 answers

Sia ? 3 years, 5 months ago

0.80357

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Nokse Wangsu 3 years, 5 months ago

What is a mining of properrt

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There is a cross road with 9 metre white inside a Square Garden of side hundred metre find the area in hectare also find the area of the remaining part of Park other than Road please give me answer step by step

Posted by Arohi Panwar 3 years, 5 months ago

CBSE > Class 07 > Mathematics

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A 15 cm long ladder

Posted by Shruti Gawali 3 years, 5 months ago

CBSE > Class 07 > Mathematics

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Sia ? 3 years, 5 months ago

Please complete your question

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3/13÷(-4/65)

Posted by Harshita Chaudhary 3 years, 5 months ago

CBSE > Class 07 > Mathematics

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Sia ? 3 years, 5 months ago

Here, $\frac {3}{13} \div \frac {-4}{65}$
= $\frac {3}{13} \times \frac {65}{-4}$
= $\frac {65 \times 3}{13 \times (-4)}$
= $\frac {15}{-4}$
Therefore, the reciprocal is $\frac {-4}{15}$

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2+2÷3+4//=

Posted by Sehjal Devi 3 years, 5 months ago

CBSE > Class 07 > Mathematics

2 answers

Sahil Kumar 3 years, 5 months ago

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Vansh Singb 3 years, 5 months ago

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Someone pls send the learner's diary of chapter Data Handling. I don't know what should I write there.?

Posted by Varadh Bobith 3 years, 5 months ago

CBSE > Class 07 > Mathematics

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in a library there is 30% of computer books 5% of English books and 35% of science books and 900 books are any other subject what is the total books of English in the library

Posted by Gauri Dalal 3 years, 5 months ago

CBSE > Class 07 > Mathematics

1 answers

Abhijeet Singh 3 years, 5 months ago

5%English+30%Computer+35%Science=70% of books 100%-70%=30% And other are 900 ,which is equal to 30% Solving 30% of total book = 900 other books. We get Total books = (900*100)/30=3000 Total books=3000 5% of total book is English Thus, Number of English book= 5% of 3000= 5*3000/100 =150(Answer)

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If the diagonals of a rhombus measure 16cm and 30cm . Find its perimeter

Posted by Sapana Bharsakle 3 years, 5 months ago

CBSE > Class 07 > Mathematics

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what is the percentage decrease on a DVD recorder that is priced down from

$2890 to$ 1053

Posted by Sunaiha V.R. 3 years, 5 months ago

CBSE > Class 07 > Mathematics

1 answers

Abhijeet Singh 3 years, 5 months ago

decrease% = (Decrease in value/Initial value)*100 Decrease= 2890-1053= 1837 D%= (1837/2890)*100 =63.56%

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Equation solve to 10 Addition problems

Posted by Sairaj Patil 3 years, 5 months ago

CBSE > Class 07 > Mathematics

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Exercise 5.1 questions no.A

Posted by Ayush Pandey 3 years, 5 months ago

CBSE > Class 07 > Mathematics

3 answers

Gauri Dalal 3 years, 5 months ago

Sum of complementary angle = 90° Therefore , complement of 20° = 90°-20°=70° Like this u can do all questions of exercise 5.1 question A.

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Alisha Sanjeev 3 years, 5 months ago

LET COMPLEMENT =X X+20=90 X=90-20

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Tejaswita Gupta 3 years, 5 months ago

20 + 70 =90

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For learners diary what we learn from ch 1

Posted by Angel Sarkar 3 years, 5 months ago

CBSE > Class 07 > Mathematics

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Ganesha ports of fans around 3 sides of his garden ab BC and CD the fence cost rupees 7.50 per metre calculate the cost of the fence if ab is equal to 35

Posted by Gayatri Singh 3 years, 5 months ago

CBSE > Class 07 > Mathematics

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Classify into monomials, Binomials and Trinomials a) 4y - z b) 100 c) z ^ 2 - 3z + 8 d) 7mn e) 2a - a + b f) x + 3y - 4z

Posted by Omm Sahu 3 years, 5 months ago

CBSE > Class 07 > Mathematics

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Under a given correspondence, two right-angled triangles are congruent if the hypotenuse and a leg of one of the triangles are equal to the hypotenuse and the corresponding leg of the other triangle.’ The above is known as (а) SSS congruence of two triangles (b) SAS congruence of two triangles (c) ASA congruence of two triangles (d) RHS congruence of two right-angled triangles

Posted by Devarth Mishra Mishra 3 years, 5 months ago

CBSE > Class 07 > Mathematics

1 answers

Sia ? 3 years, 5 months ago

If the hypotenuse and leg of one right triangle are congruent to the corresponding parts of another right triangle, the right triangles are congruent. The "included angle" in SAS is the angle formed by the two sides of the triangle being used. The "included side" in ASA is the side between the angles being used.

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DL and BM are the heights on sides AB and AD respectively of parallelogram ABCD (fig 11.24) of the area of the parallelogram is 1470 cm2, AB = 35 cm and AD = 49 cm, find length of BM and DL

Posted by Priyanshi Rajput 3 years, 5 months ago

CBSE > Class 07 > Mathematics