12.1 Exploring Solids

# 12.1 Exploring Solids - 12.1 Exploring Solids p. 719 Defns....

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12.1 Exploring Solids p. 719

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Defns. for 3-dimensional figures Defns. for 3-dimensional figures Polyhedron – a solid bounded by polygons that enclose a single region of shape. (no curved parts & no openings!) Faces – the polygons (or flat surfaces) Edges – segments formed by the intersection of 2 faces Vertex – point where three or more edges intersect
Ex Ex : Is the figure a polyhedron? If so, how many faces, edges, & vertices are there? Yes, F = V = E = 5 6 9 No, there are curved parts! Yes, F = V = E = 7 7 12

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Types of Solids Prism – 2 2245 faces (called bases) in  planes. i.e. first example Pyramid – has 1 base, all other edges connect at the same vertex. i.e. last example Cone – like a pyramid, but base is a circle. Cylinder – 2  circle bases. or Sphere – like a ball.
More definitions Regular polyhedron – all faces are 2245 , regular polygons. i.e. a cube Convex polyhedron – all the polyhedra we’ve seen so far are convex.

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## This note was uploaded on 02/12/2011 for the course MTG 3212 taught by Professor Jackson during the Spring '11 term at University of Florida.

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12.1 Exploring Solids - 12.1 Exploring Solids p. 719 Defns....

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