Question

. In triangle ABC,BC=AB and angle B= 80 degrees. Find value of angle A *​

Answer 1

SOLUTION:-

In △ ABC, AB = BC

∠B = 80°

∠B = ∠C = 80°

•°• ∠B + ∠C + ∠A = 180°

80 + 80 + ∠A = 180

160 + ∠A = 180

∠A = 180 - 160

∠A = 20°

The value of ∠A is 20°

Explanation:-

Angle opposite to congruent sides are congruent

∠B = ∠C

Sum of all angles of triangle is 180°.