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Technology 
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Circumcircle of a Polygon  Ma...

Circles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that show the properties of a circumcircle of a polygon.
The applet shows a regular polygon where the user can drag the vertices to reshape i...
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Circumcircle of a Triangle  M...

Circles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the properties of the circumcircle of a triangle.
The applet shows a triangle where the user can drag the vertices to reshap...
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Circumference of a circle  Ma...

Circumference (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the circumference of a circle.
The applet shows a circle with a radius line.
The radius endpoints are draggable and the circle i...
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Common Tangents

Chords (Geometry) 
Java Applet 
Tool 

[0]

This applet helps you discover the common tangents between two circles.
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Concentric Circles  Math Open...

Circles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the concept of concentricity.
The applet shows two resizeable concentric circles and the common center point. As they are dragged to ...
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Construct Tangents from a Poin...

Tangents (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate how to construct the
two possible tangents to a circle from an external given point, using compass and straightedge.
It starts wi...
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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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Construct a tangent at a poin...

Tangents (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate how to construct a
tangent to a cicrle at a given point on the circle, using compass and straightedge.
It starts with the given c...
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Construct the Circumcircle of ...

Circles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that provide stepbystep instructions on how to find
the circumcircle of a triangle using only a compass and straightedge.
The method used involves...
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Diameter of a Circle  Math O...

Diameter (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the diameter of a circle.
The applet shows a circle and a diameter line, the ends of which can be dragged to show that
the diamete...
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Draw ellipse with pins and str...

Circles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that provide stepbystep instructions on how to draw an ellipse
using two pins and some string. Not strictly a Euclidean construction, but instruct...
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Euclid's Elements, Book 3, Pro...

Circles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition states that two circles that touch do not share the same center. The guide then examines the structure of the proposition. The To reset the applet, press "r" while your cursor is...
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Euclid's Elements, Book 3, Pro...

Diameter (Geometry)+ 
Java Applet 
Tool 

[0]

Euclid's proposition shows properties concerning circles, chords, and diameters. The guide then examines the structure of the proposition. The To reset the applet, press "r" while your cursor is ove...
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Euclid's Elements, Book 3, Pro...

Diameter (Geometry)+ 
Java Applet 
Tool 

[0]

Euclid's proposition shows properties concerning circles, chords, and diameters. The guide then examines the structure of the proposition. The To reset the applet, press "r" while your cursor is ove...
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Euclid's Elements, Book 3, Pro...

Circles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition deals with properties that define the center of a circle. The guide then examines the structure of the proposition. The To reset the applet, press "r" while your cursor is over ...
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Euclid's Elements, Book 3, Pro...

Circles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that two circles can only intersect up to two times. The guide then examines the structure of the proposition. The To reset the applet, press "r" while your cursor is over...
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Euclid's Elements, Book 3, Pro...

Circles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that when two circles touch one another internally once, then a line connects their intersection and two centers. The guide then examines the structure of the proposition. ...
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Euclid's Elements, Book 3, Pro...

Circles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that when two circles touch one another externally once, then a line connects their intersection and two centers. The guide then examines the structure of the proposition. ...
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Euclid's Elements, Book 3, Pro...

Circles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that two circles cannot touch more than once in order to make the intersection completely external or internal (so that they do not overlap). The guide then examines the st...
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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 3, Pro...

Diameter (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that the diameter is the greatest chord of a circle. The guide then examines the structure of the proposition. The To reset the applet, press "r" while your cursor is over...
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Euclid's Elements, Book 3, Pro...

Tangents (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that the line drawn at the tip of the diameter and perpendicular to it will fall outside the circle (and be tangent to the circle). The guide then examines the structure of...
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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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Euclid's Elements, Book 3, Pro...

Diameter (Geometry)+ 
Java Applet 
Tool 

[0]

Euclid's proposition shows that a tangent is perpendicular to the diameter of the circle at that point of intersection. The guide then examines the structure of the proposition. The To reset the app...
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Euclid's Elements, Book 3, Pro...

Diameter (Geometry)+ 
Java Applet 
Tool 

[0]

Euclid's proposition states that when a line is drawn perpendicular to a circle's tangent, then that line passes through the circle's center (and is a diameter). The guide then examines the structure...
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