Question

Show that the following case the three points are collinear:

(a) (-3.2.4).(-1, 5,9) and (1, 8, 14)

Answer 1

Here,

points:

A (-3,2,4)

B( -1, 5,9)

C (1,8,14)

Now according to formula

$Area of ABC = \frac{1}{2}( x1(x2 - x3) + x2(x3 - x1) + x3(x1 - x2)$

$= 0$