Question

In triangle abc,if ab=ac and angleb=65, find angle c and angle a.

Answer 1

Since AB=AC,it's an isosceles triangle.Thus the angles corresponding to the equal sides are also equal. 

=>∠c=65°

Since sum of angles in a triangle is 180°,
∠a+∠b+∠c=180°

=>∠a=180°-130°=50°