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[" Fig."12.22],[" Ina "/PQR" ,if "PQ=QR"...

[" Fig."12.22],[" Ina "/_PQR" ,if "PQ=QR" and "L,M" and "N" are the mid-points of the sides "PQ,QR" and "RP],[" respectively.Prove that "LN=MN" ."]

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