Chapter 3 - Parallel and Perpendicular Lines - 3-7 Equations of Lines in the Coordinate Plane - Practice and Problem-Solving Exercises - Page 196: 66

$D$

Option A is true. Plane ABCD is parallel to plane EFGH. Therefore, this answer is incorrect because we are looking for the false statement. Option B is true. Plane ABCD and plane CDHG both intersect line CD. Therefore, this answer is incorrect because we are looking for the false statement. Option C is true. Plane ABCD and plane ABC are indeed the same plane. Therefore, this answer is incorrect because we are looking for the false statement. Option D is false. Plane ADHE and plane DCG are not parallel; in fact, they are perpendicular to one another. Therefore, this answer is correct because it is a false statement, which is what we are looking for.