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# CBSE Class 10 Answered

How can we prove that the three given points are collinear ,using the SECTION FORMULA?
Asked by Mdivya | 12 Mar, 2009, 11:06: AM

You should assume that one of the three point divides the line in  k :1 ratio either internally or externally. Now find the value of k by using section formula.

(Internally)

(Externally)

Here m : n should be replaced by k :1

If the two values of k are equal. Then the three points are collinear.

You can also prove three points to be collinear by finding the slope = (y2- y1)/ (x2- x1)

Answered by | 12 Mar, 2009, 03:01: PM

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