Question

17. In triangle ABC, E and F are the midpoint of AB and AC respectively. If EF = 5.
then find BC.​

Answer 1

by midpoint theorem , EF||BC and EF =1/2BC
5 = 1/2 BC
BC = 5x2 = 10 cm

Answer 2

BC = 10  if In triangle ABC, E and F are the midpoint of AB and AC respectively. and EF = 5.

Step-by-step explanation:

In triangle ABC, E and F are the midpoint of AB and AC

=> AB/AE  = BC/EF  = AC/AF

AE = AB/2   AF = AC/2

=> AB/AE = 2   & AC/AF =2

=> BC/EF = 2

=> BC = 2 * EF

=> BC = 2 * 5

=> BC = 10

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