1. 1. Square side A. 2. 2. Square side B. 3. 3. Add both squared answers together. 4. 4. Take the square root of step 3.
http://www.ehow.com/how_2140728_righttriangeusin...

You can use pythagorean theorem twice to find the diagonal of a cube.
http://wiki.answers.com/Q/How_do_you_use_a_Pythago...

checking to see if the first layout for a building is 'square'is one. Even a dumbass bricklayer or builder ( I was one once..)knows that you can check a corner for squareness by constructing
https://answers.yahoo.com/question/index?qid=20080...

Sum of the squares of the legs of a right
http://www.chacha.com/question/howdoyoufindthe...
