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 7cm, 8cm and 9 cm, respectively, find the perimeter of ΔDEF.

In a ΔABC,D,E and F are respectively, the mid-points of BC, CA and AB

1.	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 7cm, 8cm and 9 cm, respectively, find the perimeter of ΔDEF.
Answer» In a $Δ A B C, D, E$ and F are respectively, the mid-points of BC, CA and AB. If the lengths of side AB, BC and CA are 7cm, 8cm and 9 cm, respectively, find the perimeter of $Δ D E F$ .