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Technology 
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Euclid's Elements, Book 3, Pro...

Chords (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that chords that are equally distant from the center are equal and vice versa. The guide then examines the structure of the proposition. The To reset the applet, press "r"...
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Euclid's Elements, Book 4, Pro...

Chords (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows how to inscribe a given segment in a circle whose diameter is greater than or equal to the segment (making the segment a chord of the circle). The guide then examines the s...
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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.
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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.
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Pie Chart

Circle graphs (Math 4)+ 
Java Applet 
Tool 

[2]

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

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.
More: lessons, discussions, ratings, reviews,...

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.
More: lessons, discussions, ratings, reviews,...

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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