# 11.5: Pyramids

Difficulty Level: At Grade Created by: CK-12
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Practice Surface Area and Volume of Pyramids

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### Vocabulary Language: English Spanish

TermDefinition
lateral edges Edges between the lateral faces of a prism.
lateral faces The non-base faces of a prism.
Cone A cone is a solid three-dimensional figure with a circular base and one vertex.
Pyramid A pyramid is a three-dimensional object with a base that is a polygon and triangular faces that meet at one vertex.
Vertex A vertex is a point of intersection of the lines or rays that form an angle.
Volume Volume is the amount of space inside the bounds of a three-dimensional object.
Cavalieri's Principle States that if two solids have the same height and the same cross-sectional area at every level, then they will have the same volume.
Base Edge The base edge is the edge between the base and the lateral faces of a prism.
Slant Height The slant height is the height of a lateral face of a pyramid.
Apothem The apothem of a regular polygon is a perpendicular segment from the center point of the polygon to the midpoint of one of its sides.

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