Hi trigcalc4! Let me try the first one for you.

Let

Then

We know that in a right triangle is OPPOSITE/ADJACENT, so we can assume that Opposite = 3 and Adjacent is = 1 so the hypotenuse is by Pythagorean Theorem.

We also know that is equal to HYPOTENUSE/ADJACENT so

We know that

So we're done!

The others are relatively easier and you can try them by yourself.

If your still confused feel free to ask again.