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Euler line  Math Open Referen...

Centers of triangles (Geometry) 
Computer 
Tool 

[0]

An interactive applet and associated web page that describe the Euler line. It shows a triangle whose vertices can be dragged.
As you drag them, the centroid, circumcenter and orthocenter mov...
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Medians of a Triangle

Centers of triangles (Geometry) 
Computer 
Support Material 

[0]

The definition and an illustration of the medians of a triangle. From Illuminations' IGD: Interactive Geometry Dictionary.
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The Centroid of a Triangle

Centers of triangles (Geometry) 
Computer 
Lesson Plan 

[0]

This lesson provides directions for teaching about the centroid of a triangle using Geometer's Sketchpad.
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Center of a Regular Polygon  ...

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that the definition of the center of a regular polygon.
The applet presents a regular polygon, where the user can drag any vertex to resize it, an...
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Centers of Triangles

Centers of triangles (Geometry) 
Java Applet 
Tool 

[1]

See the different centers of a triangle and how they are related to the medians, perpendicular bisectors, and altitudes of the triangle. Students can manipulate the triangle and try to answer the fol...
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Circumcircle of a Triangle  M...

Centers of triangles (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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Construct the Circumcircle of ...

Centers of triangles (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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Constructing Incenter and Inci...

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate how to construct the incircle of triangle using compass and straightedge.
It starts with a given triangle, and using animation tha...
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Constructing the circumcenter ...

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that provide stepbystep animated instructions on how to
construct the circumcenter of a triangle.
The animation can be run either co...
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Constructing the incenter of a...

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that provide stepbystep animated instructions on how to
construct the incenter of a triangle.
The animation can be run either contin...
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Constructing the orthocenter o...

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that provide stepbystep instructions on how to construct the orthocenter of a triangle
using only a compass and straightedge.
The method used invo...
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Euclid's Elements, Book 4, Pro...

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows how to inscribe a circle within a given triangle. The guide then examines the structure of the proposition. The To reset the applet, press "r" while your cursor is over th...
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Euclid's Elements, Book 4, Pro...

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows how to circumscribe a circle about a given triangle. 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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Euler Line

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

Use this applet to find out how to construct the Euler line. Part of Illuminations' IGD: Interactive Geometry Dictionary.
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Eyeballing Game

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

The user is given 7 tasks. Each involves using estimation to achieve a geometric task. Two samples are: moving a ray so that it is an angle bisector, and moving a vertex of a quadrilateral so that it ...
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Orthocenter of a triangle. Mat...

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet demonstrating the concept of the orthocenter of a triangle.
The applet shows a triangle where the user can drag the vertices around. The orthocenter and...
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Simson Line of a Triangle

Centers of triangles (Geometry) 
Java Applet 
Tool 

[1]

Use this applet to discover how to construct the Simson line of a triangle.
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The Altitude Theorem for Equil...

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

Intrigue students with a surprising property of equilateral triangles, stimulate their curiosity to wonder why the property is true, then lead them to understand how the property can be proven in an u...
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The Incenter of a Triangle  M...

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet demonstrating the concept of the incenter of a triangle.
The applet shows a triangle where the user can drag the vertices around. The incenter and the a...
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Triangle Circumcenter  Math O...

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

The applet shows a triangle which the user can resize by dragging any of its vertices.
It shows the three perpendicular bisectors of the sides and the point where they intersect  the circumc...
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WebGrapher

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

This is a Java graphing applet that can be used online or downloaded. The purpose it to construct dynamic graphs with parameters controlled by user defined sliders that can be saved as web pages or em...
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A "Possibly New Theorem"

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

This guided exploration, using Geometer's Sketchpad, leads students to notice what John Conway saw in this triangle construction.
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A Continuation of Minimum Peri...

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

A further guided exploration of triangles inscribed within triangles, using Geometer's Sketchpad.
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A Triangle Center

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

In this guided exploration, students use Geometer's Sketchpad to discover a characteristic of one of the special triangle centers.
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Angle Bisectors in a Triangle

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

A guided exploration of the angle bisectors of a triangle, and the point at which they intersect, using Geometer's Sketchpad.
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