11-1 Space Figures and Cross Sections. Objectives To recognize polyhedra and their parts To visualize cross sections of space figures. A polyhedron is a space figure, or three-dimensional figures, whose surfaces are polygons. Each polygon is a face of the polyhedron .
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Each polygon is a faceof the polyhedron.
An edge is a segment that is formed by the intersection of two faces.
A vertexis a point where three or more edges intersect.
D, E, F, G, H
DE, EF, FG, GD, DH, EH, FH, AND GH
and quadrilateral DEFG
You can think of this as a very thin slice of the solid.
p. 691: 1, 3, 6-8, 18-20
The cross section is a rectangle.