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- Rolling a coin around a coin
- Lichtblau, Daniel
- Curves, Plane Geometry
- The red circle rolls on the outside of the black circle of radius 1. (The blue point shows how it rolls.) An invisible point at distance q from the center of the black circle is attached to the red circle, tracing out a path as the red circle rolls; such curves are called epitrochoids. When the circles have the same radius, you can see that the blue point is oriented in the same direction after half a revolution. Therefore a coin rolling completely around another coin of the same size goes through two complete revolutions
- Componente Curricular::Educação Superior::Ciências Exatas e da Terra::Matemática
- Wolfram Demonstration Project
- Educação Superior::Ciências Exatas e da Terra::Matemática::Análise
- This demonstration needs the "MathematicaPlayer.exe" to run. Found in http://objetoseducacionais2.mec.gov.br/handle/mec/4737
- Demonstration freeware using Mathematica Player
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