13. Some planes are visible and other are invisible. For example, plane ADE is a visible plane.
You can see the outline of the flat surface creating the plane. Plane EHBC is invisible.
Use the figure to:
a. Name a point that is coplanar with CDH.
b. Name a point that is coplanar with ABG.
C. Which plane (CDH or ABG) is invisible?
A
E
B
D
C
H
G