Can someone help me thru this? ?

Do you see above the "60" degree mark, the corner with the little right-angle in it? And the corner to the left of the "y" with other right-angle in it? Those little right-angles indicate that those corners are exactly 90 degrees each. That means that both those triangles are right triangles. And as you know, if you add up the interior angles of any triangle, the total has to be 180 degrees, right? So now you can fill in all the interior angles of those two right triangles. That's the first step. The next step would be to apply the Pythagorean Theorem. Good luck!