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Technology 
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Euclid's Elements, Book III, D...

Chords (Geometry) 
Java Applet 
Tool 

[0]

Provides Euclid's definition of similar segments of a circle and inspects it. To reset the applet, press "r" while your cursor is over the diagram.
More: lessons, discussions, ratings, reviews,...

Euclid's Elements, Book III, P...

Chords (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that two points on the circumference are connected by a segment within the circle. The guide then examines the structure of the proposition. The To reset the applet, press...
More: lessons, discussions, ratings, reviews,...

Euclid's Elements, Book III, P...

Chords (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition states properties of segments within a circle. The guide then examines the structure of the proposition. The To reset the applet, press "r" while your cursor is over the diagram.
More: lessons, discussions, ratings, reviews,...

Euclid's Elements, Book III, P...

Chords (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition states properties of segments within a circle. The guide then examines the structure of the proposition. The To reset the applet, press "r" while your cursor is over the diagram.
More: lessons, discussions, ratings, reviews,...

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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Intersecting Chords Theorem  ...

Chords (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the "Intersecting Chords" Theorem.
(When two chords intersect each other inside a circle, the products of their segments are equal.)
...
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Circle Graph

Circle graphs (Math 4)+ 
Java Applet 
Tool 

[0]

This activity allows the user to graph data on a circle graph. Students can use predefined data sets or enter their own data.
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Circle Grapher

Circle graphs (Math 4)+ 
Java Applet 
Tool 

[1]

This tool allows users to create a customized circle graph as well as display preset circle graphs.
More: lessons, discussions, ratings, reviews,...

Pie Chart

Circle graphs (Math 4)+ 
Java Applet 
Tool 

[2]

This applet allows the user to make pie charts.
More: lessons, discussions, ratings, reviews,...

Identifying Conics Quiz

Circles (Algebra II)+ 
Java Applet 
Activity 

[2]

A 10 question multiple choice quiz requiring students to identify a conic by the equation in standard form. Immediate feedback is provided.
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Graphing the Equation of a Cir...

Circles (Algebra II)+ 
Flash 
Support Material 

[0]

This minilesson explains the basics of a circle such as radius, center, etc., as well as how to identify the key elements and graph the circles.
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Conic_Connections

Circles (Algebra II)+ 
Sketchpad 
Tool 

[1]

The user manipulates a plane and doublenapped cone to generate graphs and equations of conic sections. Eccentricity, foci, and directrices are also illustrated in both 2 and 3D.
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Matching Equations to Descript...

Circles (Algebra II)+ 
JavaScript 
Tool 

[0]

Match each of the equations with the description of the graph created by the equation (hyperbola, parabola, circle, ellipse, line, and other).
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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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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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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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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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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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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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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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Circles: Definitions and Formu...

Circles (Geometry)+ 
JavaScript 
Support Material 

[0]

The user reviews circles, terms related to circles, and formulas and equations associated with circles.
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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.
More: lessons, discussions, ratings, reviews,...

Hypotrochoid

Circles (Geometry)+ 
Java Applet 
Support Material 

[0]

This Math Images page catalogs the hypotrochoid, along with a basic description, mathematical explanations, related links, and references.
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Measuring Circles (Geometry)

Circles (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains more about measuring circles, including segment lengths and angle measures, as well as using the relationship of circumference to diameter.
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