Question

What is the value of x in this triangle? Enter your answer in the box. x = A triangle with angle measures 39 degrees and 102 degrees. The third angle has an unknown measure, x degrees.

Answer 1

39°

Explanation:

You want to know the measure of the third angle in a triangle with two angles given as 39° and 102°.

Angle sum theorem

The angle sum theorem tells you the sum of angles in a triangle is 180°.

39° +102° +x = 180°

x = 39° . . . . . . . . . . . . subtract 141° from both sides

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