Question

In a triangle ABC, BC =AB and ∟B = 110°. Then ∟A is equal to: option are 35° 40° 70° 100°

Answer 1

triangle is isosceles

a=c

let a=x

x=x

b=+c+a=180

110+x+x=180

110+2x=180

2x=180-110=70

x=70/2

x=35

a=35