Ncert Solutions For Class 7 Maths Ex 6.2

Ncert Solutions For Class 7 Maths Chapter 6 Ex 6.2

Question 1:

Find the value of the unknown exterior angle a in the following diagrams:

6

Answers:

Since the exterior angle = sum of the interior opposite angles, then

(a) a = 500 + 70 = 1200

(b) a = 650 + 450 = 1100

( c) a = 300 + 400 = 700

(d ) a = 60 + 60= 1200

(E) a = 50 + 50= 1000

(F) a = 60+ 30= 900

 

Question 2:

Find the value of the unknown interior angle a in the following figures:

7

Answers:

Since the exterior angle = sum of the interior opposite angles, then

(a) a + 50o = 115o    =>  a = 115o – 50 o = 65 o

(b) 70 o  + a = 100o  => a = 100o – 70o = 30o

( c) a + 90o = 125o  => a = 120 o – 90 o = 35 o

(d) 60 o  + a = 120 o  => a = 120 o – 60 o  = 60 o

(e) 30 o  + a = 80 o  => a = 80 o +30 o = 50 o

(f) a + 35 o = 75 o   => a = 75 o – 35 o = 40 o

 

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