Advanced Geometric Problem & Solution (Twice a week update) Now 4503 problems posted.
<Qua-2024-743>, hint
Let BB', DD' be the altitudes.
Triangles PBB' and PDD' are similar ----> PDD'=<PBB'
Hence triangles PXB and PYD are congruent --->PB=PD
Similarly PA=PC. Hence ABCD is parallelogram.
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