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a polyhedron is convex if any two points on its surface can be connected by a segment that lies entirely inside or on the polyhedron
-tetrahedron (4 faces)
-octahedron (8 faces)
-dodecahedron (12 faces)
-icosahedron (20 faces)
Volume Addition Postulate
the volume of a solid is the sum of the volumes of all its non-overlapping parts
if two solids have the same height and the same cross-sectional area at every level, then they have the same volume
two solids with equal ratios of corresponding linear measures, such as heights or radii
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