Big Ideas Math Integrated I, 2016
BI
Big Ideas Math Integrated I, 2016 View details
3. Postulates and Diagrams
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Exercise 14 Page 463

If the four points are coplanar, they all lie on the same plane.

Yes.

Practice makes perfect

If the four points are coplanar, they all lie on the same plane. Let's highlight these points in the diagram.

As we can see, N and M are both points on plane X. Additionally, since KL is also on plane X, we know that the four points are coplanar.