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Resource Name 
Topic (Course) 
Technology 
Type 
$? 
Rating 

Interactive Circle

Circles (Geometry)+ 
Flash 
Tool 

[1]

Use the interactive circle to create the following circle parts:
Radius
Diameter
Tangent
Chord
Sector
Inscribed Angles
Central Angle
Segment
Ar...
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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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Construct a circle Through 3 P...

Circles (Geometry) 
Java Applet 
Tool 

[1]

An interactive applet and associated web page that demonstrate how to construct the circle that passes through all three given points.
The applet starts with three given points and the user can si...
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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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GeoCon HD

Circles (Geometry)+ 
iPad 
Tool 
$ 
[1]

GeoCon HD is designed to be used by students, teachers and math enthusiasts studying plane geometry. With GeoCon HD various constructions can be created with the touch of a finger. Resolve constructio...
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GeoCon

Circles (Geometry)+ 
iPhone 
Tool 
$ 
[1]

GeoCon is designed to be used by students, teachers and math enthusiasts studying plane geometry. With GeoCon various constructions can be created with the touch of a finger. Resolve construction task...
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Geoboard  Circular

Angles (Geometry) 
Java Applet 
Tool 

[1]

Use circular geoboard to illustrate angles and degrees.
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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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Radians

Angles (Geometry) 
Flash 
Tool 

[2]

Flashbased introduction to converting between degrees and radians. College Cram charges access fees by the month or by the semester for most resources. To get a preview of their tools, see their ...
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Euclid's Elements, Book 3, Pro...

Circles (Geometry) 
Java Applet 
Tool 

[1]

Euclid's proposition shows how to draw a straight line from a given point that touches a given circle. The guide then examines the structure of the proposition. The To reset the applet, press "r" wh...
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Computing Pi

Pi (Geometry) 
Computer 
Tool 

[1]

The Greek mathematician Archimedes approximated pi by inscribing and circumscribing polygons about a circle and calculating their perimeters. Similarly, the value of pi can be approximated by calculat...
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Get in Line

Circles (Geometry) 
Calculator 
Activity 

[1]

A calculator activity involving perimeter and circumference.
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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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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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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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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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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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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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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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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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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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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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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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