Fundamental Ideas
Geometric Solids
A pyramid is a solid that has the following characteristics.
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It has one base, which is a polygon.
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The vertices of the base are each joined to a point, not in the plane of the base. This point is called the vertex of the pyramid.
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The triangular sides, all of which meet at the vertex, are its lateral faces.
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The segments where the lateral faces intersect are lateral edges.
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The perpendicular segment from the vertex to the plane of the base is the altitude of the pyramid.
