Determine if the points (1,5),(2,3) and (-2,-1) are collinear​

1 thought on “Determine if the points (1,5),(2,3) and (-2,-1) are collinear​”

1. A(1,5),B(2,3)andC(−2,−11)

   Now, AB=

   (1

   2

   )+(2

   2

   )

   =

   5

   BC=

   (4

   2

   )+(14

   2

   )

   =

   212

   CA=

   (1

   2

   )+(16

   2

   )

   =

   257

   As,CA>BC>AB

   If points A,BandC are collinear then AB+BC=CA

   But

   5

   +

   212

   

   =

   257

   So they are not collinear.

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