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Question

Diagonals AC and BD of trapezium ABCD in which AB DC, intersect each other at O. Prove that the triangle AOD is equal in area to triangle BOC.

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Solution

It can be observed that ΔDAC and ΔDBC lie on the same base DC and between the same parallels AB and CD.

∴ Area (ΔDAC) = Area (ΔDBC)

⇒ Area (ΔDAC) − Area (ΔDOC) = Area (ΔDBC) − Area (ΔDOC)

⇒ Area (ΔAOD) = Area (ΔBOC)


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