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Resource Name 
Topic (Course) 
Technology 
Type 
$? 
Rating 

Triangle AngleSum Theorem (Ge...

Triangles (Geometry) 
Flash 
Support Material 

[0]

This lesson explains the triangle anglesum theorem and how to use it in proofs.
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Triangle Inequality (Geometry)

Triangles (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains the triangle inequality theorem and the angleside relationship.
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Triangles (Getting Started: Ge...

Triangles (Geometry) 
Flash 
Support Material 

[0]

This minilesson introduces triangles and their parts.
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Triangles Classification (Geom...

Triangles (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains the concepts and basics of Classification of Triangles as scalene, isosceles, equilateral, and so forth.
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Touch Pythagoras

Triangles (Geometry)+ 
Android 
Tool 

[0]

With this app the Pythagorean Theorem is interactive. You can change the lengths of the legs (dragging), the length of the hypotenuse with two fingers and zoom (pinch zoom) and rotate the figure (dra...
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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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Geometria

Triangles (Geometry)+ 
Computer 
Tool 

[0]

Geometria is free (GPL) crossplatform software based on a tworole (teacher, student) model. The teacher creates a problem, provides it with an answer and saves the problem in a file. The student ope...
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Random Triangles for Discoveri...

Triangles (Geometry) 
Fathom 
Tool 

[0]

Paul Myers created this demonstration as he was designing a Fathom project for Discovering Geometry. It shows when a triangle can be formed from the pieces after two random cuts are made in a 2...
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Area and Perimeter  PDA versi...

Triangles (Geometry) 
Flash 
Tool 

[0]

This activity is designed to support the understanding of perimeter and area, and to run on PDAs.
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Area and perimeter of a triang...

Triangles (Geometry) 
Flash 
Tool 

[0]

An interactive applet and associated web page that show the relationship between the perimeter and area of a triangle.
It shows that a triangle with a constant perimeter does NOT have a constant...
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Area of a Triangle

Triangles (Geometry) 
Flash 
Tool 

[1]

Flashbased introduction to finding the area of a triangle, given the base and height. College Cram charges access fees by the month or by the semester for most resources. To get a preview of thei...
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Law of Cosines  Math Open Ref...

Law of cosines (Geometry) 
Flash 
Tool 

[0]

A web page and interactive applet demonstrating the Law of Cosines.
The applet shows a triangle with draggable vertices.
As you drag them, the Law of Cosines formula is continually r...
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Law of Sines  Math Open Refer...

Law of sines (Geometry) 
Flash 
Tool 

[0]

A web page and interactive applet demonstrating the Law of Sines.
The applet shows a triangle with draggable vertices.
As you drag them, the "Law of Sines" ratio is continually recal...
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Centroid of a Triangle  Math...

Triangles (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet demonstrating the concept of the centroid of a triangle.
The applet shows a triangle where the user can drag the vertices around. The centroid and the m...
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30  60  90 Triangles  Math ...

Right (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the properties of a 306090 triangle.
The applet shows a right triangle that can be resized by dragging any vertex.
As it is drag...
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3:4:5 Triangles  Math Open Re...

Right (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the properties of a 3:4:5 triangle  one of the Pythagorean triples.
The applet shows a right triangle that can be resized by draggin...
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454590 Triangles  Math Open...

Right (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the properties of a 454590 isosceles right triangle.
The applet shows a right triangle that can be resized by dragging any vertex. ...
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Angles of a Triangle

Triangles (Geometry) 
Java Applet 
Tool 

[0]

Provides an applet that demonstrates how the three angles of a triangle add to 180 degrees. Another applet at the bottom gives stepbystep instructions on how to do this activity with a piece of pap...
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Area of a Triangle

Triangles (Geometry) 
Java Applet 
Tool 

[0]

Illustrates and defines the formula for the area of a triangle. From Illuminations' IGD: Interactive Geometry Dictionary.
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Area of a Triangle  Math Open...

Triangles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that explain the area of a triangle. The applet shows a triangle that can be reshaped by dragging any vertex.
As it changes, the area is continuall...
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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...

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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Congruent Right Triangles  HL...

Right (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that shows how right triangles that have
the hypotenuse and one other leg the same length must be congruent.
The applet shows two right triangles, ...
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Congruent Triangles

Triangles (Geometry) 
Java Applet 
Tool 

[0]

Investigate the different side and angle arrangements (SSS or ASA) that cause two triangles to be always congruent or noncongruent.
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