**Quadrilateralsand Parallelograms**

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# Exercise 9A

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Since AB || DC

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Given: O is a point within a quadrilateral ABCD

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Given: ABCD is a quadrilateral and AC is one of its disgonals.

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Given: ABCD is a quadrilateral.

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# Exercise 9B

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# Exercise 9C

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∴ PQRS is a rhombus.

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