Here's the question you clicked on:
idksucks
Help, please?
Do you understand trigonometry?
I think the answer to that is pretty clear.
But maybe one of the next 12 "please help" posts will be different.
Actually, its just adding. You have one angle and the other angle is identified as a right angle.
The sum of the interior angles of a triangle is 180 degrees.
x + 25 + 90 = 180. Solve for x.