Advanced Geometric Problem & Solution (Twice a week update) Now 4565 problems posted.
<Tri-2024-2132>, hint
R is the centroid of triangle PAB. Hence the area of triangle RAB is 1/3 of the area of
triangle PAB. Since D is the midpoint of AP [DRPT]=1/2 [ARPT]
Hence [DRESFT]=1/2 [ARBSCT]=1/2 x (1-1/3)[ABC]=1/3 [ABC]
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