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Tool: Exploring Angle Sums Using Half Turns
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Go to: http://illuminations.nctm.org/tools/tool_detail.aspx?id=9 (opens a new window)
Description: In this investigation, the user can interactively construct a figure that illustrates the sum of the interior angles in a triangle, quadrilateral or a pentagon.
Technology Type: Java Applet 
Author: NCTM: Illuminations
Language: English 
Cost: Does not require payment for use

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Courses: Math 7 Angles of polygons
Geometry Interior

Teacher Review (Not based on classroom experience)
Reviewer: suzanneh45, Aug 19 2004 04:15:17:450PM
Appropriate for: introduction to a concept, practice of skills and understandings
Ability to meet my goals: Effective
Recommended for:
Math 6: Geometry in the plane, Measurement
Math 7: Geometry in the plane, Measurement
Geometry: Angles
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