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Resource Name 
Topic (Course) 
Technology 
Type 
$? 
Rating 

Translation

Translations (Math 7)+ 
Java Applet 
Tool 

[0]

This applet demonstrates the effect of translation on a shape.
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Transversal Lines  Math Open ...

Transversals (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the transversal, a line that crosses two other (usually parallel) lines.
The applet shows two lines that are initially parallel, and ...
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Area of a Trapezoid  Math Ope...

Trapezoid (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet showing the ways to calculate the area of a trapezoid. The user can drag the vertices of the trapezoid and the other points change automatically to ensure it remai...
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Dynamic Geometry Exploration: ...

Trapezoid (Geometry) 
Java Applet 
Tool 

[2]

Two interactive trapezoids for students to use to make conjectures about midsegments. The second one allows the user to collapse the trapezoid to a triangle and make a conjecture about the relationsh...
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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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Trapezoid, definition and pro...

Trapezoid (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet showing the definition and properties of a trapezoid.
The applet shows a trapezoid where the user can drag any vertex. The other points then move in such...
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Trees as Data Structures Discu...

Tree diagrams (Math 7) 
Calculator 
Support Material 

[1]

Questions about games with more than two dice lead to discussion of trees as another kind of data structure.
More: lessons, discussions, ratings, reviews,...

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 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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