Q: How many straws would you need to make a triangular based pyramid?

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No, it has five plus the bottom :D * * * * * The previous answer is incorrect: a pyramid with 5 faces plus the bottom would be a pentagon based pyramid! A triangular based pyramid, or tetrahedron, DOES have 4 triangular faces.

If the base of the pyramid is a triangle then all its faces would be triangular in shape.

I would think so, why not

A triangular based pyramid would fit the given description

depends on the dimensions of the 4 sides

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6 of them

A triangular based pyramid would have 4 corners; three for the triangular base and one for the peak. A pyramid has twice as many edges as sides in its base; thus a triangular pyramid has 2 × 3 = 6 edges. A triangular based pyramid is called a tetrahedron.

No, it has five plus the bottom :D * * * * * The previous answer is incorrect: a pyramid with 5 faces plus the bottom would be a pentagon based pyramid! A triangular based pyramid, or tetrahedron, DOES have 4 triangular faces.

If the base of the pyramid is a triangle then all its faces would be triangular in shape.

No. A 3D triangle would be a triangular based pyramid.

9 straws because it has 9 edges, 6 vertices and 5 faces

I would think so, why not

A triangular based pyramid would fit the given description

depends on the dimensions of the 4 sides

Pyramid, but to be exact it would be a Triangular Pyramid ;) * * * * * To be exact ... but WRONG! A triangular pyramid has 4 faces and 4 vertices! A shape with 5 faces and vertices is a quadrilateral based pyramid - of which a special case would be a square based pyramid.

A triangular based pyramid would seem to fit the given description

The number of edges of the triangular pyramid is eight but the number of faces is five.* * * * *Even though put in italics, the answer is wrong. It would have been correct for a square or rectangle based pyramid but NOT a triangular pyramid. The latter has 6 edges (and 4 triangular faces).