# What is Pythagoras theorem?

Question asked by: knowitall

Pythagoras Theorem states that the square of the hypotenuse is equal to the sum of the other two sides.

In other words, the longest side of the triangle squared is the same as the sum of the square of the other two sides.

Thus if the other two sides are of length three and four centimetres the long side will be five centimetres: 9 + 16 = 25

It applies to right angled triangles.

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