six, you need six
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You'll need 18 straws because it has 18 edges
The apex, and the shape of the base does not make a difference to what it is called.
An equilateral triangle based anti prism is simply a "normal" octahedron, as described by someone trying to make things sound more complicated than they are. It has 6 vertices.
Oh, dude, a triangular prism in 2D is called a triangle. It's like a triangle, but missing that extra dimension to make it a prism. So yeah, just a good old triangle in flatland.