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OpenStudy (debpriya):
ABCD is a trapezium in which AD and BC are parallel,if the four sides AB ,BC,CD and DA are 9cm,12cm,15cm and 20cm respectively then find the magnitude of the sum of the squares of the two diagonals. (A.638 B.786 C.838 D.648)
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OpenStudy (welshfella):
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