ABCD is trapezium in which AB and CD are...

ABCD is trapezium in which AB and CD are parallel. Prove by vector methods that the mind points of the sides AB, CD and the intersection of the diagonals are collinear.

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the mid points of parallel sides of a trapezium and the point of intersection of the diagonals are collinear

ADDITION OF VECTORS
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APPLICATION OF DERIVATIVES
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