Posted by alex on Monday, October 24, 2011 at 9:10am.
triangular pyramid with base vertices C, A, E and B, D, and F
How many planes are shown in the figure?

geometry  Jai, Monday, October 24, 2011 at 9:57am
but we need to see the figure..

geometry  Steve, Monday, October 24, 2011 at 10:50am
Presumably this is a truncated triangular pyramid. So, it has a lower base CAE and an upper base BDF, and three slanting faces. Sounds like 5 faces, or planes.
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