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Tool: Secant to a Circle - Math Open Reference
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Go to: http://www.mathopenref.com/secant.html (opens a new window)
Description:

An interactive applet and associated web page that demonstrate a secant to a circle. (not trig). The applet shows a circle and a secant line. The points where the secant cross the circle are both draggable. As you drag each, the secant line moves. If you carefully make the two points coincide, it shows a message that this is now a tangent line.

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 Secants