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D= the square root of 4h/5 make h the subject of the formula

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d = \sqrt{ (4h)/(5) } \\ square \: both \: sides \\ d {}^(2) = (4h)/(5) \\ multiply \: both \: sides \: by \: 5 \\ 5d {}^(2) = 4h \\ divide \: both \: sides \: by \: 4


h = \frac{5d {}^(2) }{4}

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