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