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Question

In a ΔABC, M and N are points on the sides AB and AC respectively such that BM = CN. If B=C then show that MN || BC.

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Solution

AB=AC (sinceB=C) ....(1)

BM=CN (given)


from 1 , AM+MB = AN +NC

AM=AN ( MB=NC)

AMBM =ANNC

since MN is dividing the sides AB and AC in proportion , by Basic proportionality theorem MN || BC


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