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Prove that the line segment joining …

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Prove that the line segment joining the mid point of adjacent sides of aquadrilateral form a parallegram.
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Gaurav Seth 6 years, 9 months ago

Prove that the line segments joining the mid-points of the adjacent sides of a quadrilateral form a parallelogram

GIVEN A quadrilateral ABCD in which P. Q, R and S are the mid-points of sides AB, BC, CD and DA respectively. TO PROVE PQRS is a parallelogram.

CONSTRUCTION Join AC.
PROOF In A ABC, P and Q are the mid-points of AB and BC respectively.

PQ || AC

In Δ ACD, R and S are the mid-points of CD and DA
respectively.

SR || AC

From equations (i) and (ii), we have

PQ II AC and SR || AC

PQ || SR.

Similarly, by considering triangles ABD and BCD, we can prove that PS || QR.

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