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.

If the lengths of the sides BC, CA and AB of Delta ABC are a,b, and c repspectively and AD is the bisector of angleA then find the length of BD and DC.

Let vec a,vec b,vec c form sides BC,CA and AB respectively of a triangle ABC then