Big Ideas Math Geometry, 2014
BI
Big Ideas Math Geometry, 2014 View details
1. Points, Lines, and Planes
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Exercise 41 Page 9

Where is plane PQR in the diagram?

K, L, M, and N

Practice makes perfect

The points P, Q, and R are all on the bottom face of the cube. This means that the bottom face is contained within plane PQR. Therefore, the plane PQR is as if the bottom face of the cube was extended indefinitely in all directions.

The points that are not coplanar with P, Q, and R are then any points that are not on the bottom face of the cube. These are K, L, M, and N.