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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.: c² = a² + b² in the following diagram:
Example
Find AC in the diagram below. AB² + AC² = BC² AC² = BC² - AB² = 13² - 5² = 169 - 25 = 144 AC = 12cm
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