. D, E, F are the mid-points of sides BC, CA and AB respectively of ∆ABC.Then ∆DEF is congruent to triangle ; *
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and,
Combining these equations we get,
AF = DE ....................(i)
similarly,
AE = DF ....................(ii)
Now, in ∆AFE and ∆DFE,
FE = FE [ Common]
AF = DE [From eqⁿ(i)]
AE = DF [From eqⁿ(ii)]
So, ∆AFE = ∆DFE [SSS]
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