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CBSE Class 10 Answered

Coordinate Geometry
Asked by chahat | 01 Mar, 2009, 10:22: PM
Expert Answer

For any four points not to form a quadrilateral, three points should be collinear.

Method 1: To find which three are collinear, Find the equation of line passing through the any two points.

The equation of the line is

Now if any of the remaining two points satisfies the line implies that three points are collinear.

Method 2: Show the area enclosed by three coordinate points equal to zero.

Answered by | 02 Mar, 2009, 10:00: AM
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