| A | B |
|---|
| polyhedron | Closed three-dimensional figures made up of flat polygonal regions. |
| net | A two-dimensional figure that when folded forms the surface of a three-dimensional object. |
| lateral area | For prisms, pyramids, cylinders and cones, the area of the figure, not including the bases |
| orthogonal drawing | The two-dimensional top view, left view, frong view, and right view of a three-dimensional object. |
| perspective view | The view of a three dimensional figure from the corner |
| prism | A solid with the following characteristics: a. Two faces are formed by congruent polygons that lie in parallel planes B. the faces that are not bases are formed by parallelograms C. the intersections of two adjacent lateral faces are parallel segments. |
| regular prism | A right prism with bases that are regular polygons. |
| pyramid | A solid with the following characteristics: A. All of the faces except one face intersect at a point called the vertex. B. The face that does not contain the vertex is called the base and is a polygonal region. C. The faces metting at the vertex are called lateral faces and ar triangular regions. |
| regular polyhedron | A polyhedron in which all of the faces are regular congruent polygons. |
| face | The flat regions of a polyhedron formed by the polygons and their interiors. |
| edges | On a polyhedron, the segment formed by the intersection of faces. |
| Platonic solids | The five regular polyhedra: tetrahedron, hexahedron, octahedron, dodecahedron or icosahedron |
| cylinder | A figure with bases that are foremd by congruent circles in parallel planes |
| sphere | In space, the set of all points that are a given distance from a given point, called the center. |
| cone | A solid with a circular base, a vertex not cintained in the same plane as the base, and a lateral surface area composed of all points in the segment connecting the vertex to the edge of the base. |
| cross section | When a plane intersects a solid figure when the plane is parallel to the base of bases of the solid. |
| reflection symmetry | The symmetry of a solid with respect to a plane. |
| surface area | The sum of the areas of all faces and side surfaces of a three-dimensional figure. |
| lateral faces | In a prism, the faces that are not bases. In a pyramid, faces that intersect at the vertex. |
| lateral edges | In a prism, the intersection of two adjacent lateral faces |
| right prism | A prism with lateral edges that are also altitudes. |
| oblique prism | A prism in which the lateral edges are not perpendicular to the bases. |
| lateral area | For prisms, pyramids, cylinders and cones, the area of the figure not including the bases. |
| axis of a cylnder | A segment with endpoints at are the centers of the circular bases of a cylinder. |
| oblique cylinder | A cylinder that is not a right cylinder. |
| right cylinder | A cylinder with an axis that is also an altitude. |
| regular pyramid | A pyramid where the base is a regular polyhedron and the segment with endpoints that are the center of the base and the vertex is perpendicular to the base. |
| slant height | On a pyramid, the height of each lateral face. |
| oblique cone | A cone that is not a right cone. |
| right cone | A cone with an axis that is also an altitude |
| great circle | For a given spere, the intersection of the sphere and a plane that contains the center of the sphere. |
| hemisphere | One of two congruent parts into which a great circle separates a sphere. |
