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Resource Name 
Topic (Course) 
Technology 
Type 
$? 
Rating 

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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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 Continuation of Minimum Peri...

Triangles (Geometry)+ 
Sketchpad 
Activity 

[0]

A further guided exploration of triangles inscribed within triangles, using Geometer's Sketchpad.
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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 Minimum Perimeter Inscribed ...

Triangles (Geometry) 
Sketchpad 
Activity 

[0]

A guided exploration about triangle inscribed within triangles, and the conditions under which their perimeter is at a minimum, using Geometer's Sketchpad.
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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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Angle Bisectors in a Triangle

Triangles (Geometry)+ 
Sketchpad 
Activity 

[0]

A guided exploration of the angle bisectors of a triangle, and the point at which they intersect, using Geometer's Sketchpad.
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Angles of a Triangle

Triangles (Geometry) 
Cabri Jr. 
Activity 

[0]

Students measure the interior and exterior angles of a triangle and find their relationships.
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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  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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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 (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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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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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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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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