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Geometric Solids A geometric solid are the surfaces that surround a 3-dimensional shape. These shapes have length, width, and thickness. Example:
A cube has 6 surfaces. We call these surface ‘faces’. A cube also has 8 edges (the place where the faces meet), and 8 vertices (the point where the edges meet). Geometric solids can have flat surfaces (faces) or curved surfaces. Examples of solids with curved surfaces are a sphere, a cylinder, and a cone. Here is a cylinder:
Polyhedrons – geometric solids whose surfaces are all formed by polygons. 2 kinds of polyhedrons are: pyramids and prisms. A pyramid has a base and 3 or more faces that all meet at one vertex.
A prism has two bases connected by 3 or more polygons.
The bases of prisms are always parallel. A rectangular prism has 6 faces; 12 edges; and 8 vertices. The volume of a rectangular prism is equal to the area of the base times the height. V = (A * B) * C |
