Q. 144.1( 16 Votes )

# If the three poin

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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