In right triangle, sin(0) = 0.731 Find cos(0) to the nearest thousandth

Question

A) 0.466

B) 0.999

C) 0.682

D) 46.970

Answer 1

Did you mean θ instead of 0? If so, then this problem makes more sense.

I tried this in the degree and radian modes on my calculator, and it worked both ways. Do not change modes during the problem; pick one from the start and stick with it.

Since you know that sin(θ) = 0.731, you can get the angle back from this by doing sin^-1(0.731) in the calculator. Take that answer (either exactly or with as many decimal places as possible) and then make it the input for cosine: cos(Ans). This gets you the answer. I hope this helps!