vertical angle of an isoceles triangle is 100 degree find its base angle
Hi
Verical angle means of triangle ABC is A
angle A = 100
We know that other two angles are same in isosceles triangle
100 + x + x = 180
100 + 2x = 180
2x = 180 - 100
2x= 80
x = 80 / 2
x = 40
So the base angle is 40 degree