Question

Two of the angles in a triangle measure 13° and 54° what is the measure of the third angle

Answer 1

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The sum of the interior angles in a triangles equals 180°.

So:

13° + 54° + x = 180°

Solve for x

x = 180 - 13 - 54

x = 180 - 67

x = 113°

The third angles measures 113°.