Question

Abc is a triangle in which ab = ac. Angle b is 70º. Find angle a

Answer 1

If ab=ac that means its an isoceles triangle. In triangle abc angle a and angle b are equal, angle c can be found with help of angle sum property-
Angle a=70=angle b=70 degrees.
Angle a+b=70+70=140 degrees
Angle c=180-140=40 degrees ans.