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Question

AE || BC and D is the mid-point of BC. If area ABC = 84 cm2, what is area of BDE?


A
21cm2
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B
42cm2
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C
63 cm2
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D
84 cm2
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Solution

The correct option is B 42cm2

If we draw EC, we can see that △ABC and △BEC will have equal area. Because triangles on same base and between same parallels are equal in area.
In △ABC and △BDE the altitude is same but the length of the base is different.

Base length (△ABC) = 2 × Base length (△BDE) ( D is the mid point)

So, Area (△ABC) = 2 × Area (△BDE)

Area (△BDE) = 42 cm2


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