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Topic (Course) 
Technology 
Type 
$? 
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Perimeter of a triangle  Math...

Perimeter, area, and volume (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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Platonic Solids

Regular polyhedra (Geometry)+ 
Java Applet 
Tool 

[1]

This virtual manipulative allows you to display, rotate, and resize Platonic solids. It also allows you to select vertices, edges, and faces, and show that the number of vertices minus the number of e...
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Platonic Solids  Duals

Regular polyhedra (Geometry)+ 
Java Applet 
Tool 

[0]

With this applet it can be seen that a platonic dual is two platonic solids, one placed inside the other. The vertices of the inner platonic solid are the center points of each of the surfaces of the ...
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Platonic Solids  Slicing

Regular polyhedra (Geometry)+ 
Java Applet 
Tool 

[2]

This virtual manipulative displays a platonic solid on the left and the outline of a plane that slices through it on the right.
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Plot Plans and Silhouettes

2D pictures of 3D solids (Geometry) 
Java Applet 
Tool 

[0]

Visualization activity; given front and side views, devise a workable top view (with heights). Instructions and discussion built in.
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Proportioner

Perimeter, area, and volume (Geometry) 
Java Applet 
Tool 

[0]

Highlight proportion and scale with this tool that allows you to compare image dimensions by using one image to "paint" another. Use the Warm Up activity to familiarize yourself with the tool.
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Right Angles

Quadrilaterals (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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Rotating Houses

2D pictures of 3D solids (Geometry) 
Java Applet 
Tool 

[2]

Students are presented with a 3d figure created with blocks that can be rotated and flipped using a mouse. The figure must be rotated until it matches a 2d representation of one of the views. There ...
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Side Length and Area of Simila...

Perimeter, area, and volume (Geometry) 
Java Applet 
Tool 

[1]

The user can manipulate the side lengths of one of two similar rectangles and the scale factor to learn about how the side lengths, perimeters, and areas of the two rectangles are related.
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Side Length, Volume, and Surfa...

Perimeter, area, and volume (Geometry) 
Java Applet 
Tool 

[0]

The user can manipulate the scale factor that links two threedimensional rectangular prisms and learn about the relationships among edge lengths, surface areas, and volumes.
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Similar triangles  ratio of a...

Perimeter, area, and volume (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate that in similar triangles, the ratio of their areas
is the square of the ratio of the sides. As you drag one triangle to resize it...
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Space Blocks

Surface area (Geometry)+ 
Java Applet 
Tool 

[1]

Create and discover patterns using three dimensional blocks.
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Space Blocks (tPoW version)

2D pictures of 3D solids (Geometry) 
Java Applet 
Tool 

[3]

Manipulate the threedimensional blocks to think about what the arrangement looks like from a front, side, and/or back view. Visualize a twodimensional representation in a threedimensional environme...
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Special Triangles

Quadrilaterals (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 (Isometric) Cubic Crystal ...

Prisms (Geometry) 
Java Applet 
Tool 

[0]

These applets give 3D depictions of cubic crystals. Click on each picture of a crystal and drag to rotate it, in order to see its 3D shape.
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The Area of a Trapezium

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

This applet demonstrates the source of the area formula for the trapezium.
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Tomography Game

Perimeter, area, and volume (Geometry)+ 
Java Applet 
Tool 

[4]

This game challenges you to identify a threedimensional object based only on its intersections with a plane. The height of this plane can be changed using a slider control. This simulation of a compu...
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Tomography Game: Practice

Perimeter, area, and volume (Geometry)+ 
Java Applet 
Tool 

[1]

A practice area to review or learn to identify the categories and their objects that can appear in the Tomography Game.
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Transformation of a Pentagon

Regular polygons (Geometry) 
Java Applet 
Tool 

[0]

This applet demonstrates conservation of area throughout transformations of a pentagon.
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Two Squares  Maximum Area

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

This applet has a corresponding problem that deals with maximizing the area of two overlapping squares.
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Volume inside a cube  Math Op...

Prisms (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the volume of a cube.
A cube is shown where the edge length can be changed by dragging.
The volume is continuously recalculated ...
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Volume inside a cylinder  Ma...

Cylinders (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the volume of a cylinder.
A cylinder is shown where the height and radius can both be changed by dragging.
The volume is continu...
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Area of Polygons and Circles

Quadrilaterals (Geometry)+ 
JavaScript 
Tool 

[1]

The user reviews area and learns the different formulas for the area of special geometric figures. After viewing examples, users can interactively practice finding the area of shapes with given param...
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Area of a Circle Calculator

Perimeter, area, and volume (Geometry) 
JavaScript 
Tool 

[0]

This is a calculator for area of a circle, which allows students to enter the radius or diameter. It then shows the solution steps to solve the entered problem.
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Cone, Sphere, and Cylinder Vol...

Volume (Geometry) 
JavaScript 
Tool 

[0]

Enter the radius and height and the script will calculate the volume for the 3 shapes. If the height is equal to 2r, the relationship of the cone being 1/3 of the volume of the cylinder, the sphere be...
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