Prove that the diagonals of a parallelogram bisect each other and given conditions are
ABCD is a parallelogram, in which AB II DC
and AD II BC, and the diagonals AC and BD intersect at the point O.
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Given : ||gm ABCD in which diagonals AC and BD bisect each other.
To Prove : OA = OC and OB = OD
Proof : AB || CD (Given)
∠1 = ∠2 (alternate ∠s)
∠3 = ∠4 = (alternate ∠s)
and AB = CD (opposite sides of //gm)
∆COD = ∆AOB (A.S.A. rule)
OA = OC and OB = OD
Hence the result.
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