Triangle

3x x 2x

the sum of all the angles is 180 for all Triangles. so if the sum is 180 find x:

the equation is 180 Divided by 6 for all 6 of the xs'. 180/ by 6 is 30. 3x is 90. 2x is 60 and x is 30.

The equation for finding the sum of all the angles is # of Angles minus 2 times 180.