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

Triangles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that for two triangles with two equal sides but with unequal bases, then the angle between the equal sides will be greater for the triangle with the greater base. The guide...
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Euclid's Elements, Book I, Pro...

Triangles (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition shows that the sum of the interior angles of a triangle is the measure of two right angles (180 degrees). The guide then examines the structure of the proposition. To reset the ...
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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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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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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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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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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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Polygons Unit Quiz

Triangles (Geometry)+ 
JavaScript 
Tool 

[2]

Users interactively test their understanding of polygons and area with this unit quiz.
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Random Triangles for Discoveri...

Triangles (Geometry)+ 
Fathom 
Tool 

[0]

Paul Myers created this demonstration as he was designing a Fathom project for Discovering Geometry. It shows when a triangle can be formed from the pieces after two random cuts are made in a 2...
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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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Special Triangles

Triangles (Geometry)+ 
Java Applet 
Tool 

[0]

Provides an applet that demonstrates how to construct triangle given the lengths of the sides.
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The Triangle  Math Open Refer...

Triangles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that introduce the concept of a triangle.
The applet shows a triangle where the user can drag the vertices to reshape it. As it is being dragged a b...
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The Triangles of a Polygon  M...

Triangles (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that illustrate the triangles that can be drawn inside a polygon. The applet has
a pentagon with the triangles drawn. The user can change the number...
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Triangle Inequality  Math Ope...

Triangles (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the concept of triangle inequality.
The applet shows a triangle where the vertices can be dragged to reshape the triangle
It shows...
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Triangle similarity test  AAA...

Triangles (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page showing how the AAA similarity test works.
Two similar triangles are shown that can be resized by dragging. The other triangle adjusts to remain...
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Triangle similarity test  SAS...

Triangles (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page showing how the SAS similarity test works.
Two similar triangles are shown that can be resized by dragging. The other triangle adjusts to remain...
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Triangle similarity test  SSS...

Triangles (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page showing how the SSS similarity test works.
Two similar triangles are shown that can be resized by dragging. The other triangle adjusts to remain...
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Types of Triangles (Acute, Obt...

Triangles (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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Working With Triangles

Triangles (Geometry) 
Java Applet 
Tool 

[0]

Demonstrates different ways of working with triangles includes orthocenter, circumcenter and center of gravity java simulations.
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Touch Pythagoras

Triangles (Math 4)+ 
Android 
Tool 

[0]

With this app the Pythagorean Theorem is interactive. You can change the lengths of the legs (dragging), the length of the hypotenuse with two fingers and zoom (pinch zoom) and rotate the figure (dra...
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Triangle Classification

Triangles (Math 4)+ 
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

Triangles (Math 4)+ 
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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Congruent Triangles

Triangles (Math 5)+ 
Java Applet 
Tool 

[0]

This manipulative allows you to construct two triangles from various combinations of sides and angles. You can choose to work with any one of four different cases: SSS, SAS, ASA, and SSA
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Pythagoras' Theorem

Triangles (Math 5)+ 
Flash 
Tool 

[1]

Test yourself on the Pythagorean Theorem and its applications in these ten questions.
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