Q. 144.1( 16 Votes )

If the three poin

Answer :

For the lines to be in a line, the slope of the adjacent lines should be the same.

Given points are A(h,k),B(x1,y1) and C(x2,y2)


So slope of AB = BC = CA



Slope of AB =


Slope of BC =


Slope of CA =


=


Now Cross multiplying the first two equality,




Hence proved.


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