Advanced Mathematics - Using the dot product in vector proofs - example 4
Using the dot product in vector proofs - Example 4 (co-linear points)
To show three points are co-linear (on the same line), you will need to
find the vectors between pairs of points and show they are parallel with a
point in common.
This shows the vectors are parallel.
They are also co-linear as they have a point (P) in common.
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