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Topic (Course) 
Technology 
Type 
$? 
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Thales Theorem  Math Open Ref...

Circles (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet illustrating Thales' Theorem
(the diameter of a circle always subtends a right angle to any point on the circumference).
The applet shows a circle wher...
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Area of a Circle Calculator

Radius (Geometry)+ 
JavaScript 
Tool 

[0]

This is a calculator for area of a circle, which allows students to enter the radius or diameter. It then shows the solution steps to solve the entered problem.
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Circle Solver

Diameter (Geometry)+ 
JavaScript 
Tool 

[0]

The user can enter the circle's area, diameter, or circumference and this tool will solve for the other two pieces of data.
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Circles

Circles (Geometry) 
JavaScript 
Tool 

[0]

The user reviews circles and the important terms and properties related to circles. After viewing examples, users can interactively practice matching the term with the correct part of the circle.
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Dimensions from a Chord

Circles (Geometry)+ 
JavaScript 
Tool 

[0]

This tool came about when an acquaintance asked about setting a concrete form for a circular porch when the radius could not be measured from the center of the arc (there was a rather large building i...
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Area of a Circle

Circles (Geometry) 
Sketchpad 
Tool 

[1]

This is a downloadable Geometer's Sketchpad file that illustrates the source of the area formula for a circle.
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Areas of Regular Polygons and ...

Circles (Geometry)+ 
Sketchpad 
Tool 

[1]

Students manipulate the number of sides in a regular polygon, develop a formula relating the area and perimeter of the polygon, and use their result to develop a formula relating the circumference ...
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CenterRadius Form

Circles (Geometry) 
Sketchpad 
Tool 

[0]

This is a downloadable Geometer's Sketchpad file that illustrates the source of the centerradius area of a circle formula. Scroll halfway down this page in order to find the link to download this fil...
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Examining Angles in Circles

Angles (Geometry)+ 
Sketchpad 
Tool 

[0]

Investigate central angles, inscribed angles, angles formed by a tangent and chord, angles formed by intersecting chords, angels formed by two secants, angles formed by a tangent and a secant, and ang...
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Examining Segments in Circles

Chords (Geometry)+ 
Sketchpad 
Tool 

[0]

Investigate the segment relationships in circles relating to chords, secants and tangents.
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Funhouse Mirrors

Tangents (Geometry) 
Sketchpad 
Tool 

[0]

A Geometer's Sketchpad tool for constructing distorted images that can be viewed undistorted with a cylindrical mirror. The file contains tabbed pages with several images, a grid for students to draw...
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