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GeoGebraGeoGebra Classroom

Circumference of a Circle and Pi

Topic:
Circle
This applet illustrates the circumference of a circle by wrapping a string around it.
  • Drag the blue point to change the diameter of the circle.
  • Measure the circumference.
  • Calculate the ratio of the circumference to the diameter 
  (enter first "=" followed by "circumference/diameter").