Question

is an isosceles triangle is base angle is 4 times of its Vertical angle find the angles of the triangle

Answer 1

Let the vertical angle=x
base angle =4x
There are two equal base anglesin a isoceles triangle
Therefore,
4x+4x+x=180
9x=180
x=20

Therefore,
Angles are 20,80,80

Answer 2

Let angle A(vertical angle) be x
B and C are base angles there they 4x each
ATQ
4X+X+X=180°
X=20°

A=4X20=80°
B=20°
C=20°