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Unit 13

3D Figures

TermDefinition
polygon A closed plane figure formed by three or more segments.
diagonal of a polygon A segment that connects any two nonconsecutive vertices of a polygon.
vertex of a polygon A common endpoint of two sides of a polygon.
Face A flat surface of the polyhedron.
Edge A segment that is the intersection of two faces of the figure.
Polyhedron A closed three-dimensional figure formed by four or more polygons that intersect only at their edges.
Vertex The point that is the intersection of three or more faces of the figure.
Base A face of a three-dimensional figure by which the figure is measured or classified.
Prism A polyhedron formed by two parallel congruent polygonal bases connected by lateral faces that are parallelograms.
Pyramid A polyhedron formed by a polygonal base and triangular lateral faces that meet at a common vertex.
Net A pattern of two-dimensional figures that can be folded to make a three-dimensional figure.
Surface Area The total area of all faces and curved surfaces of a three dimensional figure.
Lateral Face A face of a prism or a pyramid that is not a base.
Lateral Area The sum of the areas of the lateral faces of a prism or pyramid, or the area of the lateral surface of a cylinder or cone.
Tetrahedron Triangular pyramid; A polyhedron formed by a polygonal base and triangular lateral faces that meet at a common vertex.
Volume The number of cubic units needed to fill a given space
triangular prism A polyhedron formed by two parallel congruent triangular bases connected by lateral faces that are parallelograms.
cross section A plane shape that results from cutting through a three-dimensional object.
intersection A point or set of points common to two or more geometric figures.
Created by: Mrs Ott
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