Five
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A triangular pyramid has 5 planes. * * * * * In fact, a triangular pyramid is also known as a tetrahedron and as its name suggests, it has 4 plane faces.
If it is a right pyramid then four, otherwise one or none.
There are 3 planes of symmetry in a rectange.
five, all looking from the top, one every 72o
There is only one net to a triangular pyramid.