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Resource Name 
Topic (Course) 
Technology 
Type 
$? 
Rating 

GeoCon HD

Centers of triangles (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

Centers of triangles (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...
More: lessons, discussions, ratings, reviews,...

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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Exploring Centers of a Triangl...

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

Using problem solving skills, formal geometry, and The Geometer's Sketchpad, students will model and solve two realworld problems by constructing the incenter and circumcenter of triangles. St...
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Exploring Centers of a Triangl...

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

Using problem solving skills, formal geometry, and The Geometer's Sketchpad, students will model and solve a realworld problem by constructing the centroid of a triangle. Students will explore...
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Geometry Quickies #1

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

The activity based around medians in this series may generate some questions. Here is a further exploration of the topics it raised, again with reference to Geometer's Sketchpad.
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Medians in a Triangle

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

Students discover various properties of the three medians of a triangle. The link to the activity itself is to a zip file that contains a pdf file of the activity.
This is a free sample a...
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Medians in a Triangle

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

A guided exploration of medians in a triangle using Geometer's Sketchpad.
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The Centroid of a Triangle

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

An exploration using Geometer's Sketchpad of the centroid of a triangle, and the way it divides the larger triangle.
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Two Minimum Length Problems an...

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

A guided exploration of minimum distances from vertices of a triangle or quadrilateral to a point within the figure, using Geometer's Sketchpad.
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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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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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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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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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