Question

If ∠A and ∠B are two adjacent angles of a parallelogram. If ∠A = 70°, then ∠B = ?

(a) 70° (b) 90° (c) 110° (d) 180°​

Answer 1

Step-by-step explanation:

110°

Answer 2

ANSWER:

(a) 70° ✔️

The value of ∠B = 70°

SOLUTION:

TO find :

the value of ∠B

Given that ∠A = 70°

Value of ∠B

= ∠A + ∠B = 180°

( the sum of adjacent angles is 180°)

= 70° + ∠B = 180°

= ∠B = 70° - 180°

= ∠B = 110°

.°. ∠B = 110°

Let check !

∠A + ∠B = 180°

70° - 110° = 180°

180° = 180°

LHS = RHS

Hence , checked !