Question

in a equilateral triangle on angle is 5x

what is x

Answer 1

In an equilateral triangle each angle is 60°. So 5x = 60° ⇒ x = 60/5 = 12°.

(You can also use angle sum: 3·5x = 180° ⇒ 15x = 180° ⇒ x = 12°.)