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, 1 month ago

CBSE > Class 07 > Mathematics

1 answers

Preeti Dabral 3 years, 1 month ago

63 ,̊ 27 ̊

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Up coming test when mam

Posted by 5541426 Manish.Cheekati 3 years, 1 month ago

CBSE > Class 07 > Mathematics

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Kt Tiwari 3 years, 1 month 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, 1 month ago

CBSE > Class 07 > Mathematics

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Jass Kaur 3 years, 1 month 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, 1 month ago

CBSE > Class 07 > Mathematics

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Gayathri R 3 years, 1 month ago

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Sunita Bindi 3 years, 1 month ago

213+321

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5/9×-4/7÷8/27×-3/4

Posted by Karishma Arora 3 years, 1 month ago

CBSE > Class 07 > Mathematics

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Sia ? 3 years, 1 month ago

0.80357

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Nokse Wangsu 3 years, 1 month 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, 1 month ago

CBSE > Class 07 > Mathematics

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A 15 cm long ladder

Posted by Shruti Gawali 3 years, 1 month ago

CBSE > Class 07 > Mathematics

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Sia ? 3 years, 1 month ago

Please complete your question

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3/13÷(-4/65)

Posted by Harshita Chaudhary 3 years, 1 month ago

CBSE > Class 07 > Mathematics

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Sia ? 3 years, 1 month ago

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

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2+2÷3+4//=

Posted by Sehjal Devi 3 years, 1 month ago

CBSE > Class 07 > Mathematics

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Sahil Kumar 3 years, 1 month ago

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Vansh Singb 3 years, 1 month 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, 1 month 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, 1 month ago

CBSE > Class 07 > Mathematics

1 answers

Abhijeet Singh 3 years, 1 month 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, 1 month 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, 1 month ago

CBSE > Class 07 > Mathematics

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Abhijeet Singh 3 years, 1 month 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, 1 month ago

CBSE > Class 07 > Mathematics

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Exercise 5.1 questions no.A

Posted by Ayush Pandey 3 years, 1 month ago

CBSE > Class 07 > Mathematics

3 answers

Gauri Dalal 3 years, 1 month 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, 1 month ago

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

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Tejaswita Gupta 3 years, 1 month ago

20 + 70 =90

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For learners diary what we learn from ch 1

Posted by Angel Sarkar 3 years, 1 month 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, 1 month 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, 1 month 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, 1 month ago

CBSE > Class 07 > Mathematics

1 answers

Sia ? 3 years, 1 month 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, 1 month ago

CBSE > Class 07 > Mathematics