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Pythagorean Theorem: In a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.
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In the above right triangle \(ABC\), the legs are \(AB\) and \(BC\), and the hypotenuse is \(AC\).
So it can be written as, \(AC² = AB² + BC²\).
Here \(BC = a, AB = b\) and \(AC = c\).
Substituting the known values,
\(c² = a² + b²\).