According to the pythagorean theorem: a2+b2=c2. So let's plug in some values for a, b and c.
If a is 3 and b is 4 then a2 is 9 and b2 is 16. 9+16 = 25, so c2 =25. To to find c, we take the square root of 25, which is 5. So we conclude that c=5.
Calculating the Hypotenuse in PHP
By Angela Bradley, About.com
The hypotenuse is the longest side of a right triangle. A right triangle is a triangle with one of the angles being a right angle (90 degrees.) The hypotenuse is the side that is directly opposite of this 90 degree angle. In the diagram above, the hypotenuse is c, the red line.
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