Big Ideas Math Integrated I, 2016
BI
Big Ideas Math Integrated I, 2016 View details
3. Postulates and Diagrams
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Exercise 15 Page 463

Collinear means that two or more points fall on the same line.

No.

Practice makes perfect
If three points are collinear, they all lie on the same line. Let's highlight these points in the diagram.

Because the dimensions of the planes are not something that we can clearly see when they are shown in a two-dimensional representation, we cannot assume that the points are collinear.