When we divide side a by the sine of angle A

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it is equal to side b divided by the sine of angle B,

and also equal to side c divided by the sine of angle C

The sum of the measures of a triangleâ€™s angles is 180 degrees. So find the sum of angles *A* and *B*, and subtract that sum from 180.

180 â€“ (84 + 58) = 180 â€“ 142 = 38

Angle *C* measures 38 degrees.

Find the measure of side *b*.

- Using the law of sines and the proportion