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Given right triangle ABC, angle B=28 degrees, and side c=54.8in. Find side a.
We don't know which angle is the right angle
If it's C we have that
cos 28 = a / 54.8
Multiply both sides by 54.8
54.8 cos 28 = a ≈ 48.385
If A is the right angle, we have that
cos 28 = 54.8 / a rearrange as
a = 54.8 / cos 28 ≈ 62.06