Circumference - The Distance around a Circle

Online

ExploreLearning: Circle - Circumference and Area

http://explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=206

The Circle - Circumference and Area gizmo allow the user to adjust the size of the radius of the circle. Choose to show the Area or Circumference info to check your work. Activate the Diameter feature, and use the arc measuring tools to measure portions of the circle.

Offline/Local

GeoBoard

a. Windows Users: http://www.efdlrs.com/~paec/resource_software/geo95.exe

b. Mac Classic Users: http://www.efdlrs.com/~paec/resource_software/geocomputerinstaller.hqx

Use this fun geoboard to create geometric shapes. Customizable features include colors. Additional supports include a perimeter and area calculation tool.