Sum of three interior angles in a triangle = 180
x + 2x + 3x = 180
combine like terms
6x = 180
divide both sides by 6
x = 30
answer
30
3x + 2x + x = 180
3x - 3(30) = 90
2x - 2(30) = 60
x - x = 30
I hope this helps!
-Ayden
