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P and Q are points on opposite sides AD and BC of a parallelogram ABCD such that PQ passes through the point of intersection O of its diagonals AC and BD. Show that PQ is bisected at O.

Rectilinear Figures

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Answer

Parallelogram ABCD is shown in the figure below:

P and Q are points on opposite sides AD and BC of a parallelogram ABCD such that PQ passes through the point of intersection O of its diagonals AC and BD. Show that PQ is bisected at O. Rectilinear Figures, ML Aggarwal Understanding Mathematics Solutions ICSE Class 9.

Considering △OAP and △OCQ we have,

⇒ ∠OAP = ∠OCQ (Alternate angles are equal)

⇒ OA = OC (As diagonals bisect each other)

⇒ ∠AOP = ∠COQ (Vertically opposite angles)

Hence, △OAP ≅ △OCQ by ASA axiom.

OP = OQ (By C.P.C.T.)

Hence, proved that PQ is bisected at O.

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