Question

in triangle abc angle a=100° and ab=ac find angle b and c

Answer 1

ab= ac
angle b = angle c (angles opposite to equal
sides are equal )
a + b+ c= 180°
100 + x +x = 180°
100 + 2x = 180°
2x = 80°
x= 40°
b= 40°
c= 40°

Answer 2

this triangle have two side equal(ab=ac).
so angle b and c is equal. so let the side be X.
so,x+x+100degree=180degree
=2x+100degree=180degree
2x=180-100
2x=80
x=80/2=40
there for you angle B AND C is 40 degre