Question

Two angles of a triangle measure 55 degrees and 20 degrees, what is the measure of the third angle of the triangle?

Answer 1

Third angle = 105

Explanation:

Let the third angle be x

55 + 20 + x = 180 {Angle sum property of triangle}

75 + x = 180 {Subtract 75 from both sides}

x = 180 - 75

x = 105