Question

In triangle abc,ab=ac and angle b =30 degree, find angle a

Answer 1

Answer:

If AB=AC then ABC is an isosceles triangle

so, angle B = angle C ( base angles of a isosceles triangle are equal)

so, angle C =30°

and angle A = 180°-(30°+30°)

angle A = 180°-60°

=120° answer.

Answer 2

Answer:

if ac =ab the angle b is = angle c the angle c = 30

now apply asp then

30+30 +a = 180

a= 120