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.
No. A triangle, like a circle, square, parallelogram, or trapezoid are all constructs upon a single 2-dimensional plane.
Two-dimensional.
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.
square and triangle
A triangle is not a polyhedron. A triangle is a two-dimensional figure, and a polyhedron is a three-dimensional solid. An example of a triangular-shaped polyhedron is a pyramid.
No. A triangle can be a two-dimensional object whereas a pyramid must be three-dimensional (with sides that are sloped).
A 3D triangle
Tetrahedron
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.
There is not one. Triangles are two dimensional, volume is three dimensional, a triangle can therefore have an area but not a volume.
A two-dimensional shape with three sides is a triangle. A three-dimensional shape with three faces is a cylinder.