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ABCD is a trapezium with AB II DC and M,...

ABCD is a trapezium with AB II DC and M, N are points on AD and BC such that MN ll DC. If the area of ABNM is half the area of ABCD, then `x^2=` ? N (A)` a+b` (B)` a^2+ b^2` (C)`(a^2+b^2)/2 `(D) none of these RF 9cm, CF 12cm, if BE is perpendicular to CF, then

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