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Topic (Course) 
Technology 
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Triangle Geometry

Acute (Geometry) 
Java Applet 
Activity 

[1]

This eModule presents realworld problems that motivate students to work with triangle geometry. Interactive worksheets and diagrams with feedback help students learn to solve for unknown angles and s...
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Triangle Geometry

Acute (Geometry) 
Java Applet 
Lesson Plan 

[1]

This eModule presents realworld problems that motivate students to work with triangle geometry. Interactive worksheets and diagrams with feedback help students learn to solve for unknown angles and s...
More: lessons, discussions, ratings, reviews,...

Euclid's Elements, Book I, Def...

Acute (Geometry) 
Java Applet 
Tool 

[0]

Gives Euclid's original definitions of an equilateral, isosceles, scalene, rightangled, obtuseangled, and acuteangled triangle and then examines the definitions' validity and durability. To reset t...
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Euclid's Elements, Book II, Pr...

Acute (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition states properties about the sides and angles of acute triangles. The guide then examines the structure of the proposition. To reset the applet, press "r" while your cursor is ove...
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Triangle Classification

Acute (Geometry) 
Java Applet 
Tool 

[0]

An interactive Java Illustration for classification of triangles. The types displayed are scalene, acute, obtuse, right, isosceles, and equilateral.
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Triangle Classification Game

Acute (Geometry) 
Java Applet 
Tool 

[1]

In this activity the interactivity attempts to train the user in the classification of triangles with respect to sides and internal angles. The user should move the vertices of a triangle on a square ...
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Types of Triangles (Acute, Obt...

Acute (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the three types of triangle: acute, obtuse and right.
The applet shows a triangle that is initially acute (all angles less t...
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Triangles

Acute (Geometry) 
JavaScript 
Tool 

[0]

The user reviews different classifications of triangles by their sides and angles. After viewing examples, users can interactively practice matching different triangles with their correct classificat...
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A "Possibly New Theorem"

Centers of 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...

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

A further guided exploration of triangles inscribed within triangles, using Geometer's Sketchpad.
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A Triangle Center

Centers of 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

Centers of 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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Exploring Centers of a Triangl...

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

Using problem solving skills, formal geometry, and The Geometer's Sketchpad, students will model and solve two realworld problems by constructing the incenter and circumcenter of triangles. St...
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Exploring Centers of a Triangl...

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

Using problem solving skills, formal geometry, and The Geometer's Sketchpad, students will model and solve a realworld problem by constructing the centroid of a triangle. Students will explore...
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Geometry Quickies #1

Centers of 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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Medians in a Triangle

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

Students discover various properties of the three medians of a triangle. The link to the activity itself is to a zip file that contains a pdf file of the activity.
This is a free sample a...
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Medians in a Triangle

Centers of 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

Centers of 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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Two Minimum Length Problems an...

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

A guided exploration of minimum distances from vertices of a triangle or quadrilateral to a point within the figure, using Geometer's Sketchpad.
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The Centroid of a Triangle

Centers of triangles (Geometry) 
Computer 
Lesson Plan 

[0]

This lesson provides directions for teaching about the centroid of a triangle using Geometer's Sketchpad.
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Medians of a Triangle

Centers of triangles (Geometry) 
Computer 
Support Material 

[0]

The definition and an illustration of the medians of a triangle. From Illuminations' IGD: Interactive Geometry Dictionary.
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Euler line  Math Open Referen...

Centers of triangles (Geometry) 
Computer 
Tool 

[0]

An interactive applet and associated web page that describe the Euler line. It shows a triangle whose vertices can be dragged.
As you drag them, the centroid, circumcenter and orthocenter mov...
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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...

Centers of 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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