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Question
Find the unknown side in the following triangles
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Solution
From ∆ABC, by Pythagoras theorem
BC2 = AB2 + AC2
Take AB2 + AC2
= 92 + 402
= 81 + 1600
= 1681
BC2 = AB2 + AC2
= 1681
= 412
BC2 = 412
⇒ BC = 41
∴ x = 41
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