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
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
Heptagonal pyramid * * * * * No. A heptagonal pyramid has 8 vertices. You need a hexagonal pyramid or a pentagonal dipyramid for 7 vertices. Or, in 2d, a heptagon.
Yes. for example to make a pyramid, you need 4 triangles and a square
Two: a pentagonal base and 5 triangular faces. The triangles need not all be the same and if you count them as different shapes, there will be six shapes in all.
Each end of the prism will have a parallel 6 sided hexagon joined together by 6 rectangles.
You cannot make a hexagon out of rectangles and so you will never be able to make the two bases of the hexagonal prism. And these two hexagons, after all, are what give the shape its name.
You'll need 18 straws because it has 18 edges
There can be a quadrangular pyramid or a quadrangular prism or other quadrangular shapes. "Quadrangular" is an adjective, not a noun. You need to be more specific.
8