When we divide side a by the sine of angle A
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