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[" In the figure,"BE perp AC" .AD is any...

[" In the figure,"BE perp AC" .AD is any line from "A],[" to "BC" intersecting "BE" in "H" ."P,Q" and "R" be the "],[" mid-points of "AH,AB" and "BC" .Prove that "],[/_PQR=90^(@)" ."]

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