What do I need the Pythagoras theorem for?

As an example you can use it to calculate the length of the hypotenuse in a triangle. The square of the hypotenuse is equal to the sum of the squares of the other two sides.

As a formula a^2 + b^2 = c^2 

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Related Maths GCSE answers

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Find the roots of the equation: x^2-2x-3=0


How do I solve a simultaneous equation?


Solve, by method of substitution, the simultaneous equations: 5x+y=22 2x+y=10


What is a product of prime factors?