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# Chapter Twelve

### Extending Surface Area and Volume

TermDefinition
right prism a prism with lateral edges that are also altitudes.
Oblique prism if the lateral edges are not perpendicular to the bases.
right cyclinder if the axis of a cylinder is also the altitude, then a cylinder is a right cylinder.
oblique cylinder if the axis of a cylinder is NOT also the altitude.
isometric views corner views of 3-D geometricsolids
lateral faces faces that are not bases
lateral edges lateral faces intersect at lateral edges, which are parallel and congruent.
Base edges the lateral faces intersect at the base at base edges.
altitude perpendicular segment that joins the planes of the bases.
height length of the altitude.
lateral area of a prism the sum of the areas of the lateral faces.
axis of a cylinder the segment with endpoints that are centers of the circular bases.
regular pyramid base that is a regular polygon and the altitude has an endpoint at the center of the base.
slant height the height of each lateral face.
spherical geometry geometry on a sphere
similar solids have exactly the same shape but not necessarily the same size.
congruent solids the same shape and the same size.
non-Euclidian geometry geometry in which at least one of the postulates of Euclidean geometry fails. (Example: Parallel Postulate does not hold true on a sphere.)
Created by: amgeometry