Explanation:
Angles in a triangle..all add up to 180°,
no matter what the shape of the triangle might be
So hence...,
; x + 2x + 3x = 180
; 6x = 180...then divide both sides by 6
;Hence..., x = 30
;If x = 30,then we start to substitute the x part on our angles with 30,
x = 30°
2x = 60°
3x = 90°