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In a ΔABC, D, E and F are, respectively, the mid points of BC, CA and AB. If the lengths of side AB, BC and CA are 7 cm, 8 cm and 9 cm, respectively,

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In a ΔABC, D, E and F are, respectively, the mid points of BC, CA and AB. If the lengths of side AB, BC and CA are 7 cm, 8 cm and 9 cm, respectively, find the perimeter of ΔDEF.

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In ΔABC,

D, E, F are the mid points of BC, CA and AB 

AB = 7cm 

BC = 8cm 

CA = 9cm 

We need to find out the perimeter of DEF

So, 

Perimeter of DEF 

DE+EF+DF = 4+3.5+4.5 = 12cm

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