A triangular base pyramid would fit the description.
A 3D shape with all triangular faces can be a tetrahedron pyramid.
Yes.
Triangular Prism
There can be no closed 3D shape with only one square and 3 triangles.
Numerous 3D shapes incorporate triangles in their structure. Common examples include tetrahedra, which are made entirely of triangular faces, as well as pyramids, which have a triangular base and triangular sides. Other shapes like triangular prisms and certain types of polyhedra also feature triangles as part of their geometry. Essentially, any polyhedron can contain triangular faces, making the number of 3D shapes with triangles quite extensive.
a pyramid
A pyramid.
A triangular pyramid. It has triangles on its 3 sides and a triangle on the bottom for a base.
An octagonal pyramid has eight triangles on an octagonal base. An octahedron can also be made by putting a square pyramid on another inverted square pyramid. This shape has just eight triangles and no others.
A 3D shape with all triangular faces can be a tetrahedron pyramid.
Yes.
Triangular Prism
There can be no closed 3D shape with only one square and 3 triangles.
An octahedron.An octahedron.An octahedron.An octahedron.
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Tetrahedron.
Sometimes because a sphere which is a 3d figure has a diameter