Two.
A frustum of a cone, or a sphere sliced by two planes are a couple of examples.
The section of a cone or sphere or ellipsoid or paraboloid slice by two planes.
zero-dimensional examples: Endpoints of edges (vertices and corners) Zero-dimensional figures lie in two-dimensional planes. one-dimensional examples: Edges of figures (sides and arcs) One-dimensional figures lie in two-dimensional planes.
An edge is a concept that applies to 3-dimensional objects and is the intersection of two planes that form boundaries of the object. None of these apply to a circle so the answer must be none.
Edges are one dimensional objects where two planes meet.
Not necessarily.
It is the intersection of two planes or the line joining two vertices.
Many solids. Some are: A sphere intersected by two planes, An ellipsoid intersected by two planes, Any blob intersected by two planes, A toroid (doughnut) with a wedge removed, A double-cone intersected by two planes, A cylinder.
A sphere with two slices cut out of it by planes. A torus (doughnut) with a chunk taken out of it.
There are 12 edges on a cube. There are 5 flat surfaces (planes) on a cube as well.
There are many possible answers: A cylinder A cone sliced by two planes perperndicular to its axis A toroid (doughnut) sliced by a plane vertical to its axis. A sphere sliced by two planes An ellipsoid sliced by two planes A paraboloid sliced by two planes etc.
zero-dimensional examples: Endpoints of edges (vertices and corners) Zero-dimensional figures lie in two-dimensional planes. one-dimensional examples: Edges of figures (sides and arcs) One-dimensional figures lie in two-dimensional planes.
Two.
A frustum of a cone, or a sphere sliced by two planes are a couple of examples.
A tetrahedron is a triangular based pyramid that has 4 faces, 6 edges and 4 vertices
If you draw a capital "Y" with say each angle = 120 degrees, then the three lines will represent where the edges of the planes meet each other and the centre point will be the vertex where the three planes intersect. You are basically looking at the corner of a cube at an angle. If you connect the ends of the three lines you will be looking down at a triangular pyramid (three faces with three edges and the vertex in the centre).