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Question

Diagonals AC and BD of a trapezium ABCD with ABDC intersect each other at O. Prove that ar(AOD)=ar(BOC)

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Solution

REF.Image
A trapezium ABCD where AB||DC & Diagonals AC & BD intersect each other at O.
ΔADC & ΔBDC Lie on the same base DC & between the same parallels AB & CD
Area(ΔADC)=Area(ΔBDC)
Triangle with same base & between parallels are equal in Area.
subtracting ar (ΔDOC) both side
Ar(ΔADC)Area(ΔDOC)=Ar(ΔBDC)Ar(ΔDOC)
Ar(AOD)=Ar(ΔBOC) proved.

1197420_1293607_ans_a60c339c57554462b02dd88a8f120d16.jpg

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