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Tool: Finding the Center of a Circle with Compass and Straightedge - Math Open Reference
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Go to: http://www.mathopenref.com/constcirclecenter.html (opens a new window)
Description:

An interactive applet and associated web page that provide step-by-step instructions on how to find the center of a circle using only a compass and straightedge. The method used involves constructing the perpendicular bisectors of two random chords. The bisectors intersect at the center of the circle.

The animation can be run either continuously like a video, or single stepped to allow classroom discussion and thought between steps.

Has link to a printable worksheet with two related problems. Suitable for class handout or homework.

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 http://www.mathopenref.com.

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

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Courses: Geometry Circles, Chords, Straightedge and compass