Question

In right ∆ABC, m B = 90°, m C = 40°, and BC = 10. What are the other two side lengths of the triangle?

Answer 1

To get the hypotenuse of the triangle which is AC you need to do the cos function (Make sure your calculator is in Degree mode!) It would look like this:

cos40=AC10


The other leg of the triangle (AB) would be the tan function or if you know both BC and AC you could do the Pythagorean Theorem:
a2+b2=c2


If you do tangent then your answer would be gotten like this:
tan40=AB10