Question

please solve question number 5

Answer 1

A+B+C=180
But angle B=C Because ABC is an isosceles triangle
So A+B+B=180
30+2B=180
2B=180-30=150
B=150/2=75
Angle A=B=75
Now X and Y are exterior angle of triangle ABC
SO angle A + B=Angle Y(Exterior angle theorem)
3O+75=Y
Y=105
As same Thing do with angle X=105