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Topic (Course) 
Technology 
Type 
$? 
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Circles in the Plane

Circles (Geometry) 
Cabri Jr. 
Activity 

[0]

Students investigate the relationships between the equation of a circle, the length of its radius, and the coordinates of its center.
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Get in Line

Circles (Geometry) 
Calculator 
Activity 

[1]

A calculator activity involving perimeter and circumference.
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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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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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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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Circumscribed Triangles

Circles (Geometry) 
Sketchpad 
Activity 

[0]

A guided exploration of the relationship between the midpoints of a triangle inscribed in a circle, and the center of the circle, using Geometer's Sketchpad.
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Determining the Uniqueness of ...

Circles (Geometry) 
Sketchpad 
Activity 

[0]

Are there a certain number of arbitrary points such that there exists a unique circle through them? To explore and conjecture an answer to this question, students will construct circles passing throug...
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Inscribed Triangles

Circles (Geometry) 
Sketchpad 
Activity 

[0]

A guided exploration, using Geometer's Sketchpad, of a property of triangles inscribed in a circle.
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Kissing Circles

Circles (Geometry)+ 
Sketchpad 
Activity 

[0]

This guided exploration, using Geometer's Sketchpad, examines the properties of tangent circles ("osculating" or kissing circles).
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Three Tangents to a Circle

Tangents (Geometry) 
Sketchpad 
Activity 

[0]

A guided exploration of a triangle formed by three tangents to a circle, and interrelations between its perimeter and the location of the tangents, using Geometer's Sketchpad.
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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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Spirograph Machine, or Tea cup...

Circles (Geometry) 
Computer 
Lesson Plan 

[0]

This lab studies the effects (both mathematical and artistic) of circular motion as points rotate around circles. Interesting things occur when a point moves around a circle as the circle rotates arou...
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The Geometer's Sketchpad Equat...

Circles (Geometry) 
Computer 
Lesson Plan 

[0]

This activity guides students to discovering the equation of a circle.
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Paper Cup Mathematics

Circles (Geometry) 
Sketchpad 
Lesson Plan 

[0]

Imagine a discarded paper cup rolling on its side of a flat surface. What geometric shape does the path of the cup form?
Students investigate this question and begin the activity by experimenting wit...
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Euclid's Elements, Book I, Def...

Circles (Geometry) 
Computer 
Support Material 

[0]

Gives Euclid's original definitions of boundaries and figures and then examines the definitions' validity and durability.
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Geometry, Section 2

Circles (Geometry) 
Computer 
Support Material 

[0]

A collection of illustrated concepts including problems for students to work out, and standalone word problems. Includes automated feedback. Pre and posttests, answer sheets, additional help, tools,...
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The Circle

Circles (Geometry) 
Computer 
Support Material 

[0]

Provides you with the definitions of circle, radius, diameter, and circumference.
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The Radian

Circumference (Geometry) 
Computer 
Support Material 

[0]

Provides an illustration and description of radians and how they relate to 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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Circle: Arcs, Chords, Tangents...

Circles (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains some parts of circles that lie on or inside the circle but with special names, including major and minor arcs, chords, tangents, sectors, segments, and secants.
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Circles (Getting Started: Geom...

Circles (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains the geometry of circles and the relationship between different parts of the circle.
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Circumference of a Circle (Geo...

Circumference (Geometry) 
Flash 
Support Material 

[0]

This minilesson defines and explains the basics of a circle: radius, diameter, circumference and their relationship. It will also guide you through determining the circumference of a circle given a r...
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Equation of a Circle in Standa...

Circles (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains how to obtain and use the standard form of the equation of a circle, as well as how to convert between the standard and general form.
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Inscribed and Circumscribed Po...

Circles (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains concepts of and relationships between inscribed and circumscribed polygons.
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