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Topic (Course) 
Technology 
Type 
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Rating 

Median of a Trapezoid  Math O...

Trapezoid (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the median line of
a trapezoid (line linking midpoints of nonparallel sides).
The applet shows a trapezoid with all vertices drag...
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Perimeter of a trapezoid  Mat...

Trapezoid (Geometry)+ 
Java Applet 
Tool 

[0]

A web page and interactive applet show how to compute the perimeter of a trapezoid.
A trapezoid is shown that can be resized by dragging its vertices. As you drag, the perimeter is continuously...
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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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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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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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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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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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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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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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A "Possibly New Theorem"

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 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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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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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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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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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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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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Medians and Midsegment (Geomet...

Triangles (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains theorems related to medians and midsegments.
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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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Working With Triangles

Triangles (Geometry) 
Java Applet 
Tool 

[0]

Demonstrates different ways of working with triangles includes orthocenter, circumcenter and center of gravity java simulations.
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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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Special Triangles

Triangles (Geometry)+ 
Java Applet 
Tool 

[0]

Provides an applet that demonstrates how to construct triangle given the lengths of the sides.
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