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

Vertical (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that vertical angles are equal. The guide then examines the structure of the proposition. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book I, Pro...

Exterior (Geometry)+ 
Java Applet 
Tool 

[0]

Euclid's proposition shows that the exterior angle of an extended side of a triangle is greater than any of the interior angles of the triangle. The guide then examines the structure of the propositi...
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Explore Angles of Hexagons

Angles (Geometry) 
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...

Exterior (Geometry) 
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...

Interior (Geometry) 
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...

Interior (Geometry) 
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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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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Exterior Angles of a Transvers...

Exterior (Geometry) 
Java Applet 
Tool 

[1]

An interactive applet and associated web page that demonstrate the
exterior angles that are formed where a transversal crosses two lines. The applet shows the
two possible pairs of exterior a...
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Exterior Angles of a Triangle ...

Exterior (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the exterior angles of a triangle. The applet shows a triangle
where the user can drag any vertex to reshape it. The exterior angle...
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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 / Exterior Angles of ...

Exterior (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the relationship of the interior and exterior angles of a polygon.
The applet shows an irregular polygon where one vertex is draggabl...
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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 Angles of a Transvers...

Interior (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the
interior angles that are formed where a transversal crosses two lines. The applets shows the
two possible pairs of angles in...
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Interior Angles of a Triangle ...

Interior (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the properties of the interior angles of a triangle.
The applet shows a triangle where the user can drag the vertices to res...
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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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Perpendicular lines  Math Ope...

Right (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the concept of 'perpendicular'.
The applet presents two intersecting line segments, one initially at right angles to the other.
...
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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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Right Angles

Right (Geometry) 
Java Applet 
Tool 

[0]

Provides an applet that demonstrates how to construct right angle using a straightedge and a compass.
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Shape Sorter Tool

Angles (Geometry) 
Java Applet 
Tool 

[1]

Shapes have many different properties such as the lengths of their sides, measures of interior angles, and symmetry. This tool allows the user to use a Venn diagram model to sort shapes based on their...
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