This is what I know:

I figured out the ninety degrees and the seventy degrees because a right angle is always ninety degrees and a triangle always adds up to one hundred eighty degrees. The problem itself just told me "A= 20 degrees and a = 12" and gave me a triangle with letters..

It doesn't even tell me where Theta is, which really confused me. Although, I assumed that the line with C on it was the Hypotenuse, the one with 12 was the adjacent line, and the b line being the opposite line.

Using that, I could only kind of figure out Tan. Because it would be "b/12." And I think you could solve that by using the formula "12 (Tan 20) = b." Is that even right? Or is there a different way to solve it..?