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

Triangles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows how to construct a parallelogram equal to a given triangle in a given rectilinear angle. The guide then examines the structure of the proposition. To reset the applet, pre...
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Euclid's Elements, Book I, Pro...

Triangles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows how to construct a parallelogram equal to a given triangle when given a straight line in a rectilinear angle. The guide then examines the structure of the proposition. To ...
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Euclid's Elements, Book II, Pr...

Obtuse (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition states properties about the sides and angles of obtuse triangles. The guide then examines the structure of the proposition. To reset the applet, press "r" while your cursor is ov...
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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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Euler Line

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

Use this applet to find out how to construct the Euler line. Part of Illuminations' IGD: Interactive Geometry Dictionary.
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Exterior Angles of a Triangle ...

Triangles (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

Triangles (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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Folding Tape

Triangles (Geometry) 
Java Applet 
Tool 

[1]

This applet demonstrates a problem that tests your knowledge of the properties of different types of triangles. Can you recognize what type of triangle is created?
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Geoboard  Circular

Triangles (Geometry) 
Java Applet 
Tool 

[1]

Use circular geoboard to illustrate angles and degrees.
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Heron's Formula  Math Open Re...

Triangles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate how Herons Formula can be
used to find the area of a triangle when you know all three sides. A triangle is shown where the user can ...
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Identify These Triangles

Triangles (Geometry) 
Java Applet 
Tool 

[1]

This applet asks you to determine the types of triangles illustrated.
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Incircle of a Triangle  Math ...

Triangles (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet demonstrating the concept of the incircle of a triangle  the largest circle the will fit inside a triangle.
The applet shows a triangle where the user ...
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Interior Angles of a Triangle ...

Triangles (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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Isosceles Triangles  Math Ope...

Isosceles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate isosceles triangles (two sides the same length).
The applet presents a triangle where the user can drag any vertex.
As the vert...
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Medians of a Triangle  Math O...

Triangles (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet illustrating the medians of a triangle.
The applet shows a triangle where the user can drag the vertices to reshape it. As the triangle is being resha...
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MidPoint Theorem

Triangles (Geometry) 
Java Applet 
Tool 

[1]

Students investigate what is so special about the midpoints of a triangle. They discover the midpoint theorem and can answer an exploration question.
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Midsegment (midline) of a Tria...

Triangles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrates the midsegment (midline) of a triangle.
A triangle is shown that the user can reshape by dragging any vertex. As it is being dragge...
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Orthocenter of a triangle. Mat...

Centers of triangles (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet demonstrating the concept of the orthocenter of a triangle.
The applet shows a triangle where the user can drag the vertices around. The orthocenter and...
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Perimeter of a triangle  Math...

Triangles (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet show how to compute the perimeter of a triangle.
A triangle is shown that can be resized by dragging its vertices. As you drag, the perimeter is continuously r...
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Picture Proof of the Pythagore...

Law of sines (Geometry) 
Java Applet 
Tool 

[1]

Stepbystep picture proof of the Pythagorean theorem.
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Pythagoras Theorem

Right (Geometry) 
Java Applet 
Tool 

[0]

Interactive proof of Pythagorean theorem (Euclid's proof) using geometric transformations.
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Pythagoras' Theorem  Math Ope...

Right (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that illustrate Pythagoras' Theorem. The applet shows a right triangle that can be resized by dragging any vertex.
As it is being dragged the formula...
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Scalene Triangles  Math Open ...

Scalene (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the properties of scalene triangles.
The applet presents a scalene triangle where any vertex can be dragged to reshape i...
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Similar Triangles  Math Open ...

Triangles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the concept of similar triangles.
Applets show that triangles are similar if the are the same shape and possibly rotated, or ref...
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Similar triangles  ratio of v...

Triangles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate that in similar triangles, ten items are always in the same ratio to each other
(perimeter, three sides, three altitudes, three me...
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