It is the cross-section of the figure by the plane.
Since a frustum is a portion of a solid, three-dimensional figure, and a rectangle is a plane, two-dimensional figure, there can be no such thing as the frustum of a rectangle.
A two-dimensional figure, also called a plane or planar figure, is a set of line segments or sides and curve segments or arcs, all lying in a single plane. The sides and arcs are called the edges of the figure. The edges are one-dimensional, but they lie in the plane, which is two-dimensional. The triangle, the pentagon, the hexagon and the circle are just a few plane figures. Prisms and pyramids, for instance, are three-dimension figures.
An arrow can be a polygon. A polygon is any two dimensional plane figure. An arrow can, obviously, be a three dimensional object.
A decagon. A two-dimensional shape (plane figure, or polygon) which has ten sides is a decagon. A three-dimensional shape (polyhedron) which has ten sides (plane faces) is a decahedron.
It is the cross-section of the figure by the plane.
Cross Section
vertex
Two dimensional object is a plane figure where as three dimensional object is solid (space) figure.
An edge.
The plane is in two dimensional and the space figure is in three dimensional.
Presumably, the "three dimensional triangular plane" is actually a two dimensional plane which is "tilted" with respect to the axes. The point of intersection is simply the coordinates of the solution to the simultaneous equations for the line and the plane.
false
No, a square is a two dimensional plane figure.
It is the intersection of two planes or the line joining two vertices.
It is a three-dimensional figure with eleven plane surfaces.
Any plane figure or any three dimensional object