Middle School

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In quadrilateral ABCD, diagonals AC and BD bisect one another. Quadrilateral ABCD is shown with diagonals AC and BD intersecting at point P.

What statement is used to prove that quadrilateral ABCD is a parallelogram?

A. Angles ABC and BCD are congruent.
B. Sides AB and BC are congruent.
C. Triangles BPA and DPC are congruent.
D. Triangles BCP and CDP are congruent.

Answer :

Answer with explanation:

It is given that , quadrilateral A BC D, diagonals AC and B D bisect one another at point P.

In ΔAPB and ΔCPD

AP=PC

BP=PD

∠APB =∠CPD→Vertically opposite angles

ΔAPB ≅ ΔCPD→→[SAS]

→AB=CD⇒[CPCT]

→∠A BP=∠C DP⇒[C PCT]

Alternate interior angles are equal , so lines are parallel.

⇒AB║CD, and AB=CD

Similarly, we can prove ΔAPD ≅ ΔBPC, to prove AD║BC, and AD=BC.

⇒A Quadrilateral is a parallelogram , if one pair of opposite sides is equal and parallel.

Option C: The statement which is used to prove that quadrilateral ABCD is a parallelogram→→Triangles B PA and D PC are congruent.

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Rewritten by : Jeany