12-1 & 12-2

•12-1 & 12-2: Space Figures, Nets, & Diagrams.
•Objective: To recognize nets and to make isometric drawings of space figures.
•Polyhedron
•A three dimensional figure whose surfaces are polygons.
- Faces: the polygons making up the sides.
-Edges: A segment that is formed by the intersection of two faces.
-Vertex: a point where the three or more edges intersect.
•Euler’s Formula
F+V=E+2
5+6=9+2
11=11
•Space figures and Nets
Net: A two dimensional pattern that you can fold to form a three dimensional figure.
•Cross-Sections
•Cross Section: the intersection of a solid and a plane.