Question

1. which points are coplanar?

Explanation:

Coplanar points are points that lie on the same plane. In the given figure, points \(A\), \(B\), \(C\), \(D\), \(E\), and \(F\) all lie on the blue - shaded plane. Point \(R\) is just the label for the plane, not a point in the traditional sense for coplanarity (as it's the name of the plane).

Answer:

A. \(A\), B. \(B\), C. \(C\), D. \(D\), E. \(E\), F. \(F\)