Elements or parts the three sides AB BC CA and three angles A B C of a Delta ABC are together called the six parts of elements of the `Delta ABC.`

ELEMENTS OR PARTS The three sides AB BC CA and three angles \_A \_B \_C of a DeltaABC are together called the six parts or elements of the DeltaABC.

Sides the three line segments ABBC and CA that form the triangle ABC are called the sides of the triangle ABC.

ANGLES The three angles -BAC-ABC and -ACB are called the angles of Delta ABC .

SIDES The three line segments 'AB BC and CA' that form the triangle 'ABC are called the sides of the triangles 'ABC.

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 sides AB, BC and CA of Delta ABC . Find the ratio of the areas of Delta DEF and Delta ABC .

D,E,F are the mid points of the sides BC, CA and AB respectively of a triangle ABC . Determine the ratio of the areas of triangle DEF and triangle ABC .

D, E and F are the mid-points of the sides BC, CA and AB respectively of triangle ABC. Prove that: area of BDEF is half the area of Delta ABC.

D, E, F are mid points of sides BC, CA, AB of Delta ABC . Find the ratio of areas of Delta DEF and Delta ABC .

D, E, F are mid points of sides BC, CA, AB of Delta ABC . Find the ratio of areas of Delta DEF and Delta ABC .