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Two sides of a parallelogram are 30 and 20.  One diagonal has a length of 40. What is the length of the other diagonal?

 Aug 4, 2021
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The sum of the squares of the diagonal =  sum of sides squared

    40^2 +d^2  =  30^2 + 30^2 + 20^2 + 20^2

         d^2 = 1000

          d = sqrt (1000)     simplify as needed ......     ~EP

 Aug 4, 2021

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