'I' is the incentre of whose corresponding sides are respectively

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

'I' is the incentre of

\Delta ABC

whose corresponding sides are

a, b, c

respectively.

a\mathbf{IA} + b\mathbf{IB} + c\mathbf{IC}

is always equal to (1) 0 (2)

(a + b + c)\mathbf{BC}

(3)

(a + b + c)\mathbf{AC}

(4)

(a + b + c)\mathbf{AB}