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

Angles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that the sum of two angles on a straight line (supplementary) are either both right or sum to the measure of two right angles. The guide then examines the structure of the ...
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Euclid's Elements, Book I, Pro...

Angles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that if two adjacent angles with a common side sum to the measure of two right angles then they lie on a straight line. The guide then examines the structure of the proposi...
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Euclid's Elements, Book III, D...

Angles (Geometry)+ 
Java Applet 
Tool 

[0]

Provides Euclid's definitions of segments and angles in a circle and inspects them. To reset the applet, press "r" while your cursor is over the diagram.
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Exterior Angles of a Polygon ...

Angles (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that define exterior angles of a polygon and demonstrate that the exterior angles always add to
a constant (360 or 720 depending on your point of vie...
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Eyeballing Game

Angles (Geometry)+ 
Java Applet 
Tool 

[0]

The user is given 7 tasks. Each involves using estimation to achieve a geometric task. Two samples are: moving a ray so that it is an angle bisector, and moving a vertex of a quadrilateral so that it ...
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Finding Angles  Equilateral T...

Angles (Geometry) 
Java Applet 
Tool 

[0]

There are two problems that ask you to find the measure of an angle based on its relationship to surrounding angles created by equilateral triangles. You are given corresponding applets that help you...
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Finding Angles  Squares

Angles (Geometry) 
Java Applet 
Tool 

[0]

There are two problems that ask you to find the measure of an angle based on its relationship to surrounding angles created by squares. You are given corresponding applets that help you visualize the...
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Geoboard  Circular

Angles (Geometry)+ 
Java Applet 
Tool 

[1]

Use circular geoboard to illustrate angles and degrees.
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Inscribed and Central Angles i...

Angles (Geometry)+ 
Java Applet 
Tool 

[0]

A Java illstration of the theorem linking inscribed and central angles subtended by the same arcProposition III.20 from Euclid's Elements. The applet is accompanied by a discussion of the pro...
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Interior Angles of a Polygon ...

Angles (Geometry)+ 
Java Applet 
Tool 

[1]

An interactive applet and associated web page that demonstrate that the interior angles of a polygon always add to
a number related only to the number of sides.
The applet shows a polygo...
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Interior of an Angle  Math Op...

Angles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the concept of the interior of an angle. The applet
shows an angle where the user can drag the points that define it.
A freefloa...
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Linear Pair of Angles  Math O...

Angles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate a linear pair of angles. A pair of angles are shown and the user can drag the common side. It
demonstrates that they a supplementar...
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PoolARama

Angles (Geometry) 
Java Applet 
Activity 

[0]

Place your bets on whether the pool ball will get into the pocket after choosing how to make your move.
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Problem of Maximum Angle #1

Angles (Geometry) 
Java Applet 
Tool 

[0]

An applet is provided to help you visualize this problem.
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Problem of Maximum Angle #2

Angles (Geometry) 
Java Applet 
Tool 

[0]

An applet is provided to help you visualize this problem.
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Subtended Angles  Math Open R...

Angles (Geometry) 
Java Applet 
Tool 

[0]

A web page and applet that explain the concept of a subtended angle. A movable stick figure is looking at a movable flagpole. The angle subtended by the pole to the viewers eye is continuously ca...
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Supplementary Angles  Math Op...

Angles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate supplementary angles (two angles that add to 180°.)
The applet shows two angles which, while not adjacent, are drawn to strongly ...
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Types of Angle  Math Open Ref...

Angles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate various classes of angle: acute, right, obtuse, straight, reflex and full.
The applet presents an angle (initially acut...
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Types of Angles

Angles (Geometry) 
Java Applet 
Tool 

[1]

Gives definitions of acute, obtuse, and right angles along with an applet that demonstrates the different types of angles. In addition there is an applet that tests understanding of acute vs. obtuse ...
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Using a Protractor, animated d...

Angles (Geometry) 
Java Applet 
Tool 

[1]

An interactive applet and associated web page that provide stepbystep animated instructions on how to
measure angles using a protractor. Specifically, the applet uses a protractor to measure t...
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Using a protractor. Math Open ...

Angles (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that provide stepbystep animated instructions on how to
use a protractor to draw an angle.
The animation can be run either continuousl...
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Explore Angles of Hexagons

Angles of polygons (Math 7)+ 
Java Applet 
Tool 

[0]

Drag the vertices of an irregular or regular hexagon, and compare the changes this makes in their angle measures and sums of angle measures.
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Explore Exterior Angles of a P...

Angles of polygons (Math 7)+ 
Java Applet 
Tool 

[0]

Drag the points on this diagram of a pentagon, and examine what happens to the angle measures and sum of the exterior angles. Java Sketchpad activities, with points for students to observe.
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Explore Interior Angles of Pol...

Angles of polygons (Math 7)+ 
Java Applet 
Tool 

[0]

Drag the vertices of a quadrilateral or pentagon, and examine what happens to the angle measures and sum of the interior angles. Java Sketchpad activities, with guiding questions for students.
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Exploring Angle Sums Using Hal...

Angles of polygons (Math 7)+ 
Java Applet 
Tool 

[1]

In this investigation, the user can interactively construct a figure that illustrates the sum of the interior angles in a triangle, quadrilateral or a pentagon.
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