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Topic (Course) 
Technology 
Type 
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Rating 

A Min/Max Problem

Triangles (Geometry) 
Sketchpad 
Activity 

[1]

A guided exploration, using Geometer's Sketchpad, of the area of a triangle formed between two fixed rays, using a third ray with a movable end point.
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A New Discovery by Harold Sten...

Triangles (Geometry) 
Sketchpad 
Activity 

[0]

In this guided exploration, students use Geometer's Sketchpad to develop their intuition about triangles and cevians in general, and a proof by Harold Stengel in particular.
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A Triangle Center

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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Circumscribed Triangles

Triangles (Geometry)+ 
Sketchpad 
Activity 

[0]

A guided exploration of the relationship between the midpoints of a triangle inscribed in a circle, and the center of the circle, using Geometer's Sketchpad.
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Geometry Quickies #1

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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Impossible Triangles

Triangles (Geometry) 
Computer 
Activity 

[1]

Figure out what makes each of the given triangles impossible. Which triangle property is violated?
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Inscribed Triangles

Triangles (Geometry)+ 
Sketchpad 
Activity 

[0]

A guided exploration, using Geometer's Sketchpad, of a property of triangles inscribed in a circle.
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Medians in a Triangle

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

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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The Pythagorean Theoremand M...

Triangles (Geometry)+ 
TINspire 
Activity 

[0]

In this activity, students construct a triangle and ﬁnd all angle and side measures. They practice dragging the vertices to form certain types of triangles, and then they conﬁrm the Pyth...
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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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