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GCSE Maths > Trigonometry - Pythagoras

Pythagoras's Theorem

In any right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.
i.e.: c = a + b in the following diagram:

Example

Find AC in the diagram below.

AB + AC = BC
AC = BC - AB
= 13 - 5
= 169 - 25 = 144
AC = 12cm

Copyright Matthew Pinkney 2003

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