9 straws because it has 9 edges, 6 vertices and 5 faces
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five A triangular based prism has 5 A triangular based pyramid has 4 and there is no such thing as a triangular based prism pyramid - unless you mean a truncated pyramid (or a frustum) which is essentially a prism.
18 straws.
a triangular prism, square based pyramid, rectangular prism and much more
A triangular prism or a triangular based pyramid
15