The above graphic is a right triangle with
sides labeled in terms of Angle A (NOT B).

ANY right triangle
can be solved for ALL sides and angles if you just know
1) two sides OR 2) one angle and one side.

In the first case (2 sides), you can determine the 3rd
side and ALL the angles by going to the following link:
Pythagorean Theorem Calculator

In the second case (1 angle and 1 side), the known angle MUST be Angle A.
If you only know Angle B, calculate Angle A by subtracting Angle B from 90 degrees .

Click on the side that is known.

Clicking on any of these buttons will clear all 6 boxes on the right side.