Pearson Geometry Common Core, 2011
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Pearson Geometry Common Core, 2011 View details
2. Points, Lines, and Planes
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Exercise 29 Page 17

Points are coplanar if they lie on the same plane.

Noncoplanar

Practice makes perfect
We want to find the plane that contains the points X, Y, and Z. Looking at the given diagram, we can see that these lie on the vertical plane.

Points are coplanar if they lie on the same plane. The fourth point, U, does not lie on the vertical plane. Therefore, they are noncoplanar.