8.7.7 Properties of Three-Dimensional Figures

Definitions:

• • Coplanar --> Figures or lines that are on the same plane

  • Solid --> Intersecting planes that form 3-D figures

  • Polyhedron --> A solid with a flat surface made up of polygons

  • Edge --> Where two planes intersect in a line

  • Face --> A flat surface

  • Vertex --> Where three or more planes intersect at a point

  • Diagonal --> A line segment whose endpoints are vertices that are neither adjacent nor on the same face

  • Prism --> A polyhedron with two parallel, congruent faces

  • Base --> The bottom of a prism/3-D figure

  • Pyramid --> A polyhedron with one base that is a polygon and faces that are triangles

  • Cylinder --> A 3-D figure with congruent, parallel bases that are circles connected with a curved side

  • Cone --> One circular base and a vertex connected by a curved side

  • Cross Section --> The intersection of a solid and a plane