Question

in the cube shown below, which planes intersect? cdg and efi ghi and cde deh and cde cfg and deh

Explanation:

Step1: Recall plane - intersection concept

Two planes intersect if they are not parallel and share common points.

Step2: Analyze each option

• For "CDG and EFI": These planes are parallel and do not intersect.
• For "GHI and CDE": These planes are parallel and do not intersect.
• For "DEH and CDE": These planes share the line DE, so they intersect.
• For "CFG and DEH": These planes are parallel and do not intersect.

Answer:

C. DEH and CDE