Question

In triangle abc, angle a =100 and ab=ac.Find angle b and c

Answer 1

The sum of all angles is 180
But a is 100
Ab is 40 and ac is 40

Answer 2

ab=ac

therefore it is isosceles triangle.

hence angle b = angle c

Now,

in triangle ABC,

angle a + angle b+ angle c = 180

100 + b + c = 180

100 +b +b = 180

100 + 2b = 180

2b = 80

b = 40

hence angle b and angle c is 40 degree