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Tool: Arc Length - Math Open Reference
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An interactive applet and associated web page that demonstrate the concept of arc length. The applet shows a circle with part of it's circumference highlighted and the central angle shown. As the user drags either end of the arc it is redrawn and the calculation for arc length changes as you drag.

The text on the web page gives the formula for calculating the arc length.

Applet can be enlarged to full screen size for use with a classroom projector. After use in the classroom, student can access it again from any web browser at home or in the library with no login required.

This resource is a component of the Math Open Reference Interactive Geometry textbook project at

Technology Type: Java Applet 
Author: John page
Language: English 
Cost: Does not require payment for use

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Courses: Geometry Arcs