Pyramid.
Or triangular prism, depending on what exactly you mean.
What is a pyramid
There is not such thing as a three-dimensional triangle. You are thinking of a tetrahedron which is a three-dimensional figure with each side being a triangle. This has four vertices.
No. A triangle can be a two-dimensional object whereas a pyramid must be three-dimensional (with sides that are sloped).
Tetrahedron
it can be three dimensional. a polygon is three sided or more like a triangle. so to answer your question, yes.
A two-dimensional shape with three sides is a triangle. A three-dimensional shape with three faces is a cylinder.
Two-dimensional.
What is a pyramid
No. A triangle is a two-dimensional object, therefore it is not three-dimensional.
There is not such thing as a three-dimensional triangle. You are thinking of a tetrahedron which is a three-dimensional figure with each side being a triangle. This has four vertices.
NO!!! A triangle is a 2-dimensional shape of three sides; archaically a 'trigon'. A polyhedron is a 3-dimensional solid of many sides.
square and triangle
No. A triangle can be a two-dimensional object whereas a pyramid must be three-dimensional (with sides that are sloped).
Tetrahedron
A 3D triangle
a tetrahedron (aka three dimensional triangle)
There is not one. Triangles are two dimensional, volume is three dimensional, a triangle can therefore have an area but not a volume.