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Question

Diagonals of a parallelogram divide it into four triangles of equal area


A

True

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B

False

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Solution

The correct option is A

True


Draw the diagonals in the parallelogram as shown in the figure.

We know that the diagonals of a parallelogram bisect each other.

Triangle ADC and parallelogram ABCD are between same parallel lines and are on the same base, So Area(ΔADC)= 12 of Area(ABCD)------------(1)

Similarly , Area(BCD)= 12 of Area(ABCD)

Consider ADC, DO is the median of ADC.

So, Area (AOD) = Area(DOC)-----------------(2)

From (1) and (2), Area(AOD) = Area(DOC)= 14 Area(ABCD)

Similarly in BCD

Area(BOC) = Area(DOC) = 14 Area(ABCD) -----(3)

From (2) and (3),

Area(AOB) = 14 Area(ABCD)

Hence showed that diagonals of a parallelogram divide it into four triangles of equal area.


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