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Tool: Inscribed Angles
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Go to: http://www.cut-the-knot.org/.../InscribedAngles.shtml (opens a new window)
Description: An interactive Java illustration of the theorem of the angles inscribed into a circle. Inscribed angles subtended by the same asrc are equal--as stated in Proposition III.21 of Euclid's Elements. The applet is accompanied by a discussion of the proposition and its proof.
Technology Type: Java Applet 
Author: Alexander Bogomolny
Language: English 
Cost: Does not require payment for use

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Tool: Inscribed and Central Angles in a Circle
Courses: Geometry Arcs, Angles