Q. 143.9( 22 Votes )

ABC is a triangle

Answer :

Given,


Let P and Q be the mid points of AB and AC respectively



Then, PQ ││BC and PQ=…………….(i)


In ∆APQ, D and E are mid points of AP and AQ resp.


DE││PQ , DE= ………….(ii)


From (i) and(ii)


=DE=


= DE =


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