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11. Parallelograms on the same base and between same parallels are equal in area. Prove this.

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12. In figure, AD is median of triangle ABC, E is the mid-point of AD and F is the mid-point of AE.
Prove that

ar open parentheses ABF close parentheses equals 1 over 8 ar left parenthesis ABC right parenthesis.

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13. ABCD is a quadrilateral and BD is one of its diagonals as shown in figure. Show that ABCD is a parallelogram and find its area.

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14. In the given figure, AB | | DC. Show that ar(BDE) = ar(ACED).

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15.

In the given figure, ABED is a parallelogram in which DE = EC. Show that area (ABF) = area (BEC)

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16. Areas of triangles on the same bases and between the same parallels are equal in. Prove it.

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17. Prove that the area of a trapezium is equal to half of the product of its height and sum of parallel sides.

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18.

In the following figure, ABCD is a parallelogram and EFCD is a rectangle. Also, AL ⊥ DC. Prove that
(i) ar(ABCD) = ar(EFCD)
(ii) ar(ABCD) = DC x AL.

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Solution not provided.

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20. In the figure, PQRS is a parallelogram with PQ = 12 cm, altitudes corresponding to PQ and SP are respectively 8 cm and 10 cm. Find SP.

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