Well, any shape with a triangular face. I assume that you mean a shape that only has (identical) triangles for faces. There are 2: the tetrahedron with 4 triangles, and the icosahedron with 20 triangles. * * * * * What about a triangular dipyramid? Two triangular pyramids stuck together along one face?
The tetrahedron has 4 equilateral triangles as its faces.
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A pyramid - it has a square base, and four triangles meeting to a point at the top.
square-based pyramid
sqare based pyramid
Well, any shape with a triangular face. I assume that you mean a shape that only has (identical) triangles for faces. There are 2: the tetrahedron with 4 triangles, and the icosahedron with 20 triangles. * * * * * What about a triangular dipyramid? Two triangular pyramids stuck together along one face?
rectangular pyramid
The tetrahedron has 4 equilateral triangles as its faces.
a pentagonal pyramid
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A triangular prisim (3 faces on sides, one face on bottom).
A pyramid - it has a square base, and four triangles meeting to a point at the top.
square-based pyramid
4 faces are triangles and 1 face is a square the square face is the base of the pyramid
The tetrahedron. If one of the four triangles is equilateral and all others are isosceles, then one might also call it a (triangular-based) pyramid.
A rectangular-based pyramid.