Concept explainers
No sphere. Suppose we have a sphere built out of 60 triangles. Why can’t all the vertices have the same number of triangles coming into them? (Hint. Count edges by multiplying by something and then dividing by 2, and count vertices by a similar multiplying and dividing technique.)
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The Heart of Mathematics: An Invitation to Effective Thinking, WileyPLUS NextGen Card with Loose-leaf Set Single Semester: An Invitation to Effective Thinking (Key Curriculum Press)
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