Question

if a isosceles triangle a base angle is 4 times its Vertical angle find all the angles of a triangle

Answer 1

since the triangle is isosceles therefore the base angles are congruent

Let vertical angle be x

the base angles are 4x&4x

we know that the sum of all angles of a triangle is 180

so

x+4x+4x=180

9x=180

x=20

so angles are 20°,80°&80°