From the image, we are asked to identify four coplanar points in the diagram. "Coplanar" refers to points that lie on the same plane. In this case, the plane is shown as a flat, rectangular surface.

Looking at the points in the plane, points A, B, C, and D all appear to lie on this same plane.

Therefore, four coplanar points are: A, B, C, D.

Would you like further details or have any other questions?

Here are five related questions:

1. What does it mean for points to be non-coplanar?
2. How can we determine if a point is not coplanar with others in a 3D diagram?
3. What is the difference between collinear and coplanar points?
4. How can we identify if lines are coplanar or skew in 3D space?
5. Can a plane be uniquely defined by three points?

Tip: When identifying coplanar points, remember that any three non-collinear points always define a plane.