Given any 2 of the 3 fields, this Right Triangle Solver will compute the remaining one.

Right triangles have one 90 degree angle (like a square).

The side opposite that angle is the longest side (the hypotenuse),and is labeled c.

The other two sides are shorter and are labeled a and b interchangeably.

Break out your cutting mat, fabric, rulers, templates, rotary cutter, scissors, omnigrids....