Question

10 An isosceles triangle is such that the verti- cal angle is 4 times the size of the base an- gle. What is the size of a base angle?​

Answer 1

30°

Explanation:

in an isosceles triangle the base angles are always same

let the base angles be = x

vertical angle = 4x

the sum of angles in a triangle = 180°

thus,

x + x + 4x = 180°

6x = 180°

x = 180/6 = 30°