1. the formula for Pythagorean theorem is (listed above) you're trying to find what c squared is.
2. the first step: figure out the legs of the triangle. http://www.mathwarehouse.com/geometry/triangles/images/right-triangles/3-4-5-right-triangles/6-8-10_A_1.png
3. you can use this for any problem that deals with right triangles. the pictures i used were for examples only.
4. step two: substitute the values into the formula and keep in mind c is the hypotenuse.
