In a `DeltaABC,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 permeter of `DeltaDEF.`

In a Δ ABC, D,E,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, 9 cm, respectively, find the perimeter of Δ DEF.

In a DeltaABC , D, E and F are the midpoints of BC, CA and AB respectively. If the lengths of side AB, BC and CA are 7 cm, 8 cm and 9 cm respectively, the perimeter of DeltaDEF is a cm. The value of a/2 is

In DeltaABC , the lengths of the three sides AB,BC and CA are 28cm, 96 cm and 100 cm respectively. Find the value of cos C.

In the given figure, a circle is inscribed in a DeltaABC such that it touches the sides AB, BC, and CA at points D, E, and F respectively. If the lengths of the sides AB, BC, and CA are 12 cm, 8 cm, and 10 cm respectively, find the lengths of AD, BE, and CF.

construct the triangle whose lengths of the sides AB, BC and CA of the DeltaABC are 8 cm , 6 cm and 5 cm respectively.

D,E and F are respectively the mid-points of sides AB.BC and CA of /_ABC. Find the ratio of the areas of /_DEF and /_ABC .

D,E and F are respectively the mid-points of the sides BC,CA and AB of a /_ABC. Show that (i) BDEF is a parallelogram

D, E and F are respectively the mid-points of the sides BC, CA and AB of a triangle ABC . Show that:- BDEF is a parallelogram.