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If a rectangular prism has a length of l, a width of w, and a height of h, then the length of its diagonal is equal to sqrt(l^2+w^2+h^2). Suppose l=3 and h=12; if the length of the diagonal is 13, what is the width?

 Aug 7, 2020
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sqrt (3+ 122  + w2 ) = 13    square both sides

w= 132 - 3- 122                   Take it from here !

 Aug 7, 2020

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