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Topic (Course) 
Technology 
Type 
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Three Tangents to a Circle

Triangles (Geometry)+ 
Sketchpad 
Activity 

[0]

A guided exploration of a triangle formed by three tangents to a circle, and interrelations between its perimeter and the location of the tangents, using Geometer's Sketchpad.
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Why AAA does not prove congrue...

Triangles (Geometry)+ 
Flash 
Activity 

[1]

An interactive applet and associated web page that shows that angleangleangle (AAA) is not enough
to prove congruence.
The applet shows two triangles, one of which can be dragged to resize it...
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Why SSA does NOT prove congrue...

Triangles (Geometry)+ 
Flash 
Activity 

[1]

An interactive applet and associated web page that shows that sidesideangle is not enough
to prove congruence, because two triangles can meet the condition.
The applet shows two triangles, on...
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Fixed Area of a Triangle

Triangles (Geometry) 
Computer 
Lesson Plan 

[0]

This lesson gives directions for teaching the fixed area of a triangle given a fixed base and height using Geometer's Sketchpad.
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The Triangle Inequality

Triangles (Geometry) 
Computer 
Lesson Plan 

[0]

This lesson provides directions for teaching about triangle inequality using Geometer's Sketchpad.
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Triangle Inequality in Animati...

Triangles (Geometry) 
Computer 
Lesson Plan 

[0]

This lesson shows you how to create an animation of the triangle inequality using Geometer's Sketchpad.
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Area of a Triangle (Geometry)

Triangles (Geometry)+ 
Flash 
Support Material 

[0]

This mini lesson explains the formula used to calculate the area of a triangle.
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Congurent and Similar Triangle...

Triangles (Geometry)+ 
Flash 
Support Material 

[0]

This minilesson explains congruence and similarity in triangles, using these concepts to prove triangles congruent, or to determine missing measurements.
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Medians and Midsegment (Geomet...

Triangles (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains theorems related to medians and midsegments.
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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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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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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 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  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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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 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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Congruent Triangles

Triangles (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the concept of congruent triangles.
Applets show that triangles are congruent if they are the same, rotated, or reflected.
In ea...
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Congruent Triangles  ASA  Ma...

Triangles (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that shows how triangles that have
two angles and their included side the same must be congruent.
The applet shows two triangles, one of which can...
More: lessons, discussions, ratings, reviews,...

Congruent Triangles  SAS Mat...

Triangles (Geometry)+ 
Java Applet 
Tool 

[1]

An interactive applet and associated web page that shows how triangles that have
two sides and their included angle the same must be congruent.
The applet shows two triangles, one of which can...
More: lessons, discussions, ratings, reviews,...

Congruent Triangles AAS  Math...

Triangles (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that show how triangles that have
two angles and a nonincluded side the same must be congruent.
The applet shows two triangles, one of which can be...
More: lessons, discussions, ratings, reviews,...

Congruent Triangles SSS  Math...

Triangles (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that show how triangles that have all 3 sides the same length must be congruent.
The applet shows two triangles, one of which can be reshaped by dragg...
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Construct 30690 triangle. M...

Triangles (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that provide stepbystep animated instructions on how to
contruct 306090 triangle with given base length
using only a compass and straightedge.
...
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