You need nine sides, so nine straws. But you could just use one straw and cut it into nine pieces.
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A triangular prism has an amount of 4 verticies?
9 straws because it has 9 edges, 6 vertices and 5 faces
To calculate the number of straws needed to make a rectangular prism, you would need to determine the dimensions of the prism (length, width, and height) in terms of the length of a single straw. Then, you would calculate the total number of straws required by multiplying the number of straws needed for each dimension. For example, if the prism is 10 straws long, 5 straws wide, and 3 straws high, you would need 10 x 5 x 3 = 150 straws.
A triangular prism has 6 verticies
A triangular pyramid has 4 vertices, while a triangular prism has 6. Therefore, a triangular prism has 2 more vertices than a triangular pyramid.