2 hexagons and six triangles
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you need 7
To make a rectangualr pyramid,you need a rectangle for the base, and four triangles on the sides.
A pyramid has a triangle for each side of the base, thus for a square pyramid you'll need one square (for the base) and 4 triangles.
Yes if it has a unified hexagonal cross-section
Yes. for example to make a pyramid, you need 4 triangles and a square