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English[en]
The perpendicular bisectors of the sides and meet at a unique point inside . Prove that the quadrilateral is cyclic if and only if triangles and have equal areas.
Tagalog[tl]
Ang tirik bisectors ng panig at pumasa sa isang natatanging point sa loob . Patunayan na ang may apat na gilid ay paikot kung at kapag lamang triangles at ay may pantay na mga lugar.

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