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In a ∆ABC, ∠B is a right angle. If AB = 5 cm and BC = 12 cm then find the length of AC.

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In a ∆ABC, ∠B is a right angle. If AB = 5 cm and BC = 12 cm then find the length of AC.

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By Pythagorous Theorem

AC2 = AB2 + BC2

= 52 + 122

= 25 + 144

= 169

= 132

or AC2 = 132 = AC = 13 cm

Thus, length of AC is 13 cm.

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