What is the value of x?

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a triangle with angle measures thirty-nine degrees and one hundred two degrees. the third angle has an unknown measure, x degrees.

39 degrees is the measure of the 3rd. Hope I helped. :) Please click thanks.  :)

The measurement for the third angle is 39 because I added the two degrees and got 141 and I know that the total of the degrees is 180. So I subtracted 141 from 180 and got 39
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This is what i found “answer: a rigid transformation preserves both the side lengths and the angle measures of a polygon. step-by-step explanation: rigid transformations are the transformations which does not affect the size and the shape of figure .” i hope this you for what your looking for. can you plz mark me brainliest?