Question

13. In triangle ABC , <A = 70, AB = AC then <B is
equal to-​

Answer 1

ABC is an isosceles Triangle because AB = AC

So,

Angle B = Angle C ( AB = AC )

Leat Angle B and Angle C = x

Therefore

Angle A + Angle B + Angle C = 180⁰ (Angle sum prop. of triangle)

70⁰ + x + x = 180⁰

2x = 180⁰ - 70⁰

2x = 110⁰

x = 55⁰

Therefore Angle B = 55⁰

how