Question

The plane that contains the top of the box can be called plane ABCD.

Short answer

The planes ABFE and DCGH are the required planes.

Step-by-step solution

Step 1. Observe the figure

The figure contains 6 planes that are intersecting to form the constitution but the planes positioned at the opposite side of each other are the planes that are not intersecting.

Step 2. Use the observation

The planes positioned at the opposite side of each other are ABFE and DCGH.

Step 3. Make conclusion

The observation returns two planes ABFE and DCGH so these are the required planes.