Collinear and Coplanar
Are C, F and I coplanar?
Are F, B, and C coplanar?
Are N, A, F, and B coplanar?
Are H, C, and E coplanar? Use the "Create a plane through 3 points" to determine if they are.
Move point H around the plane. Are the points still coplanar?
Hit the "Refresh" button. Can you create a line through points D and A?
Are E, B, and A collinear?
Are D and A collinear?