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Topic (Course) 
Technology 
Type 
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A Continuation of Minimum Peri...

Circles (Geometry) 
Sketchpad 
Activity 

[0]

A further guided exploration of triangles inscribed within triangles, using Geometer's Sketchpad.
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A Japanese Temple Problem

Circles (Geometry)+ 
Sketchpad 
Activity 

[0]

In this guided Geometer's Sketchpad exploration, students use their knowledge of tangent circles to discover a relationship between the radii of three circles which are mutually tangent to each other ...
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Adjacent Arcs  Math Open Refe...

Arcs (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the concept of adjacent arcs.
The user can 3 drag points around a circle that define the endpoints of two adjacent arcs. Web page ha...
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Annulus, definition and proper...

Circles (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet show that an annulus is a flat (planar) ring, and can be thought of as a disk with a hole punched out of it.
Applet can be enlarged to full screen size f...
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Arc  Math Open Reference

Arcs (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the concept of an arc. The applet shows a circle with part of it highlighted to
identify the arc. Each endpoint of the arc can be d...
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Arc Central Angle  Math Open ...

Arcs (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the the concept of the central angle subtended by an arc.
The applet shows an arc and the corresponding central angle. As the arc en...
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Arc Length  Math Open Referen...

Arcs (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the concept of arc length.
The applet shows a circle with part of it's circumference highlighted and the central angle shown.
As...
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Archeology Problem

Chords (Geometry) 
Computer 
Lesson Plan 

[0]

This lesson/problem requires that students be able to construct chords to a circle and perpendicular lines in Geometer's Sketchpad.
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Area of a Circle

Circles (Geometry) 
Flash 
Tool 

[0]

Flashbased introduction to finding the area of a circle, given the radius. College Cram charges access fees by the month or by the semester for most resources. To get a preview of their tools, se...
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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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Area of a Circle (Geometry)

Circles (Geometry) 
Flash 
Support Material 

[0]

This mini lesson explains the formula used to calculate the area of a circle.
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Area of a Circle  Math Open R...

Circles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the area of a circle.
A circle is shown with a point on the circumference that can be dragged to resize the circle.
As the circle i...
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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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Area of a Segment of a Circle ...

Circles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the area of a segment of a circle  a part of a circle cut off by a chord.
The applet shows a circle and a segment of that circle, ...
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Area of an Annulus  Math Open...

Circles (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet show how to compute the area of an annulus. Text on the page explains that the area is the overall area minus the area of the circular 'hole' in the center. For t...
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Areas of Regular Polygons and ...

Pi (Geometry) 
Sketchpad 
Activity 

[0]

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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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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Central Angle Theorem  Math O...

Arcs (Geometry)+ 
Java Applet 
Tool 

[1]

A web page and interactive applet illustrate the Central Angle Theorem (an arc subtends twice the angle at the center as at the circumference). By dragging the key points with the mouse, students ...
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Central Angle of a Circle  Ma...

Arcs (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the central angle of a circlethe angle subtended at the center by two points on the circle.
The applet presents a circ...
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Chord (of a circle)  Math Ope...

Chords (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate a chord of a circle.
The applet shows a circle and two draggable points on its periphery, with the chord drawn between them.
A c...
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Chords in a Circle

Chords (Geometry) 
Sketchpad 
Activity 

[0]

Students construct chords in a circle and manipulate them to discover various properties. The link to the activity itself is to a zip file that contains a pdf file of the activity.
This i...
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Circle Geometry Whiteboard Min...

Radius (Geometry)+ 
Flash 
Tool 

[0]

Teach your geometry students advanced circle concepts with this set of interactive whiteboard minimovies. Animated flash cards bring the concepts to life while the interactive circle allows you to cr...
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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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Circle definition  Math Open ...

Circles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page defining a circle.
The applet shows a circle where the user can drag the center and a point on the circle. The radius line supports the definition
...
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