and 
form the
vertices of a right angled triangle.
Answer:
Let the position
vectors of vertices A, B and C be
and 
.
of point B
? P.V. of point A
point C ? P.V.
or point B
of point A ?
P.V. of point C
A, B, C are
vertices of 
Also 
= 2 × (?1) +
(?1) × 3 + 1 × 3
= ?2 ?3 +
5 = 0
ABC is right
angled triangle.
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