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Warm UpHow many corners does the tissue box have? How many flat surfaces? How many folded creases?Draw a net for the tissue box.
Corners: 8Flat Surfaces: 6Creases: 12
Space Figures and Cross Sections
Objectives:• To recognize polyhedrons and their parts.• To visualize cross sections of space figures.
Vocabulary^
• Why do we study the parts of a ployhedron?We can analyze a three-dimensional figure by using the relationship among its vertices, edges, and faces.
polyhedron
Problem1~
Euler’s Formula
Using Euler’s Formula
12
30
Practice*
Cross Section~
Practice*
Drawing a Cross Section
Practice*
Homework
• P692: 6, 8, 9, 11, 12, 14, 18-23
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