The icosahedron is the shape that has 20 sides. The icosahedron also has five triangular faces that join together at each vertex.
Some people describe a cone that way.
Triangular Pyramid......... The faces are Triangular....
triangular prism
The solid shape that has one square face and four triangular faces is called a pyramid. If you were to have a shape that had four triangular faces and no square face, it would be called a triangular pyramid.
The icosahedron is the shape that has 20 sides. The icosahedron also has five triangular faces that join together at each vertex.
Triangular pyramid.
Some people describe a cone that way.
That shape is a unit equilateral triangular dipyramid, and it has 6 faces.
This 3D shape could be a square based pyramid.
A pyramid with an irregular pentagon base.
A pyramid. But the point where the triangular faces meet is a vertex, not a vortex. A vortex is a spinning mass of fluid like a whirlpool!
A shape that has some triangular faces is a pyramid.
A hexahedron or a triangular dipyramid. This is the shape formed by two triangular pyramids (tetrahedrons) stuck together along one triangular face.
Triangular Pyramid......... The faces are Triangular....
A triangular dipyramid - two triangular pyramids stuck together.
An octahedron: two quadrilateral based pyramids with their bases together.