P is a point in the interior of a parallelogram ABCD. Show that 1) ar (APB) + ar (PCD) = 1/2 ar (ABCD)
2) ar (APD) + ar (PBC) = ar (APB) + ar (PCD) .
2) ar (APD) + ar (PBC) = ar (APB) + ar (PCD) .
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