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प्रश्न
D, E, and F are the mid-points of the sides AB, BC and CA of an isosceles ΔABC in which AB = BC.
Prove that ΔDEF is also isosceles.
उत्तर
DF =
DE =
EF =
EF =
From equation (i) & (ii)
DF = EF
Hence, DEF is also isosceles triangle.
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