Collinear Points Distance Formula Method

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In this lesson, we discuss how to determine if three points are collinear, which means they lie on the same line. There are many methods that can be used for this procedure. Here we will use a method that relies on our distance formula. Essentially, if three points are collinear, then the sum of the distances between two pairs of points will be equal to the distance between the remaining point. We can use our distance formula to find the three distances involved and then check to see if the two smaller distances sum to the largest distance.
Collinear Points Distance Formula Method:
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