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Semi-Regular Polyhedron<br />
Semi-regular polyhedra have at least two different regular polygons<br />
as faces. You can make these solids by cutting off equal pieces from<br />
each vertex.<br />
1. Explain why the Platonic solids are regular polyhedra.<br />
Jonathan has a strategy for counting the number of<br />
edges on the octahedron. He says, “I see eight edges<br />
in the picture, <strong>and</strong> the back side of the octahedron<br />
looks the same as the front side, so two times eight<br />
equals sixteen edges.”<br />
2. a. What might Jonathan be thinking?<br />
b. How can you change Jonathan’s statement<br />
so that you get the correct number of edges?<br />
Section D: Polyhedra 41
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