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

Third angle = 105

Step-by-step 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

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45

step-by-step explanation: