Write the six elements (i.e., the 3 sides and the 3 angles ) of `triangle` ABC

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.

D,E and F are respectively the mid points of the sides BC,CA and AB of an equilateral triangle ABC, prove that DEF is also equilateral triangle.

Write the : Angle opposite to the side LM of triangle LMN

let ABC be a right angled triangle at C. If the inscribed circle touches the side AB at D and (AD) (BD)=11, then find the area of triangle ABC. .

D,E and F are respectively the mid points of the sides AB,BC and CA of a triangle ABC. Prove that by joining these mid points D,E and F and the triangle ABC is divided into four congruent triangles.

The sides of a triangle are in A.P. and its area is (3)/(5) th of an equilateral triangle of the same perimeter. Find the greatest angle of the triangle