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Gas, Water, Electricity (Geometry and the Imagination)

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Visit this site: http://geom.math.uiuc.edu/docs/education/institute91/handouts/node12.html
Author:Conway, Doyle, Gilman, Thurston; The Geometry Center
Description: A diagram shows three houses, each connected to three utilities. Show that it is impossible to rearrange the connections so that they don't intersect each other. Could you do it if the earth were a not a sphere but some other surface?
Levels: Elementary, Middle School (6-8), High School (9-12)
Languages: English
Resource Types: Lesson Plans and Activities
Math Topics: Topology

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