Question 375984
This problem can be solved directly.
{{{c^2 = 8^2 + 15^2}}}
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You know {{{8^2 = 8*8 = 64}}} and {{{15^2 = 15*15 = 225}}}.
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So, we have {{{c^2 = 64 + 225 = 289}}}
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That means {{{c = sqrt(289) = 17}}}
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Done.