Based on the picture, if side "a" is 3 feet and side "b" is 4 feet, how long is side "c"?

After all these years I forgot the formula...shame on me.!

Pythagoras Theorom is simply C squared = A squared + B squared (C2 = A2 + B2). Then square root after A2 + B2. In mathematics, the Pythagorean theorem, or Pythagoras' theorem, is a fundamental relation in Euclidean geometry among the three sides of a right triangle. It states that the area of the square whose side is the hypotenuse is equal to the sum of the areas of the squares on the other two sides.

Any builder who has needed to set out a 90 degree angle knows a 3,4,5 triangle.

Elfcounsel, my math skills are not good so I don't do well on math questions