In a ∆ABC, D, E and F are the mid-points of side BC, CA and AB respectively. If BC = 25.6 cm, CA = 18.8 cm and AB = 20.4 cm, what is the perimeter (in cm) of the ∆DEF?
Explanation:
Since, D, E and F are the mid points.
DE = ½ × BC = 12.8 EF = ½ × AB = 10.2 FD = ½ × AC = 9.4
∴ DE + EF + FD = 12.8 + 10.2 + 9.4 = 32.4
Hence, option (c).
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