Question

Which equation can be solved to find one of the missing side lengths in the triangle? cos(60o) =

Answer 1

If we want to calculate a, then cos(60°) = a/12, but we know that cos(60°) = 1/2,
then 1/2 = a/12 and a = 6

If we want to calculate b, then sin(60°) = b/12, but we know that cos(60°) = (√3)/2
then (√3)/2 = b/12 and b = 6√3

Answer 2

The answer is:
D)  cos(60°) = a/12