## Right angled triangle

The Pythagorean Theorem state that:

“The square of the hypotenuse (the longest side) is equal to the sum of the squares of the other two sides.”

For a right angled triangle with the sides a,b and c, (where c is the hypotenuse), the formula of the Pythagorean Theorem is then given by:

If you want to calculate the length of a side, you just have to isolate a,b or c in the formula:

The formula only applies to right angled triangles. So it can also be used the other way round, to check if a triangle is right angled.