Q. 7 D4.3( 3 Votes )

# Using distance formula, examine whether the following sets of points are collinear?(- 1, 2), (5, 0), (2, 1)

Given points are A(- 1, 2), B(5, 0) and C(2, 1). We need to check whether these points are collinear.

We know that for three points A, B and C to be collinear, the criteria to be satisfied is a linear relationship between AB, BC and AC.

Let us find the distances first,

We know that distance between two points (x1, y1) and (x2, y2) is    AC = √10 ..... (1)     AB = 2√10 ..... (2)   BC = √10 ..... (3)

From (1), (2), (3) we can see that AC + BC = AB.

The three points are collinear.

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