Rectangular Prism

Given the right rectangular prism shown, how many different planes can you find that contain point B and also pass through another vertex of the prism?

Source: NCTM Mathematics Teacher 2008

SOLUTION
3 faces of the prism: BADC,BAEF,BCGF
3 diagonal planes: BEHC,BFHD,BAHG
3 3-point planes: BDE,BDG,BEG

Answer: 9

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About mvtrinh

Retired high school math teacher.
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