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Use the Pythagorean theorem: c2 = a2 + b2, in this example we need to know, let's say a. So that,

x2 = c2 - b2

x = √(212 - 72)= √(441 - 49) = √392 = √196*2 = 14√ 2

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Q: What is the height of x if the hypotenuse is 21 and the base is 7?
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