Question

An exterior angle of a triangle is 125°.If one of the two interior opposite angle is 55°.Find the other interior opposite angle

Answer 1

sum of two interior angles is exterior angle
55+x is 125
x is 125 - 55 which is 70 (55+70 is 125)
so x (or second interior angle ) is 70

Answer 2

Let other interior angle be X
X + 55 = 125 ( exterior angle = sum of interior angles)
X = 125 - 55
X = 70
therefore other interior angle is 70