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Can someone teach me how to do this?

Can someone teach me how to do this?-example-1

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Explanation:


pythagorean \: theorem \\ {hypothenes}^(2) = { {x}^(2) + {y}^(2) } \\ {17}^(2) = {x}^(2) + {15}^(2) \\ 289 = {x}^(2) + 225 \\ {x}^(2) = 64 \\ x = 8cm

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