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Question

In a triangle ABC, the medians BE and CF intersect at G. Prove that ar(∆BCG) = ar(AFGE).

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Solution

Figure
CF is median of ABC.
ar(BCF) = 12(ABC) .....(1)
Similarly, BE is the median of ABC,
ar(ABE) = 12(ABC) .....(2)
From (1) and (2) we have
ar(BCF) = ar(ABE)
ar(BCF) - ar(BFG) = ar(ABE) - ar(BFG)
ar(∆BCG) = ar(AFGE)

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