Concept explainers
Soccer ball. A soccer ball is made of pentagons and hexaons. Each pentagon is surrounded by five hexagons. Use the Euler Characteristic to figure out how many pentaons and how many hexagons are necessary to construct a soccer ball.
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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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