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Technology 
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Euclid's Elements, Book II, De...

Rectangle (Geometry)+ 
Java Applet 
Tool 

[0]

Provides Euclid's definitions for contained and gnomon and then inspects them. To reset the applet, press "r" while your cursor is over the diagram.
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Euclid's Elements, Book II, Pr...

Rectangle (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition states that the parts of a split rectangle add up to the whole. The guide then examines the structure of the proposition. To reset the applet, press "r" while your cursor is ove...
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Euclid's Elements, Book II, Pr...

Rectangle (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition states that when a rectangle is split into a square and a segment, they still add up to the whole. The guide then examines the structure of the proposition. To reset the applet,...
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Euclid's Elements, Book II, Pr...

Rectangle (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition states properties and constructions that come from splitting a rectangle. The guide then examines the structure of the proposition. To reset the applet, press "r" while your cur...
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Area of a Rectangle

Rectangle (Geometry)+ 
Flash 
Tool 

[0]

Flashbased introduction to finding the area of a rectangle, given length, width, and units of measurement. College Cram charges access fees by the month or by the semester for most resources. To ...
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Rectangle, definition and pro...

Rectangle (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet showing the definition and properties of a rectangle.
The applet shows a rectangle where the user can drag any vertex. The other points then move in such...
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Golden Rectangle  Math Open R...

Rectangle (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that illustrate the properties the "Golden Rectangle" whose sides are in the "golden Ratio" of 1 : 1.618 : 1.
The applet shows a golden rectangle whos...
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Perimeter of a rectangle  Ma...

Rectangle (Geometry)+ 
Java Applet 
Tool 

[0]

A web page and interactive applet show how to compute the perimeter of a rectangle.
A rectangle is shown that can be resized by dragging its vertices. As you drag, the perimeter is continuously...
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Paramertic Surfaces in Rectang...

Rectangular (2D & 3D) (Trigonometry)+ 
Flash 
Tool 

[0]

We present two versions of a 3D grapher that graphs a parametric surface defined in rectangular coordinates. The user enters parametric formulas for the x, y, and z coordinates and the applet draws th...
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Complexity

Rectangular Form (Trigonometry)+ 
JavaScript 
Support Material 

[0]

This support material shows the user the properties of complex numbers and provides "notes" that prove some of these properties.
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The Complex Number System (Tri...

Rectangular Form (Trigonometry) 
Flash 
Support Material 

[0]

This lesson explains complex numbers, their operations and properties, and their relation to rectangular coordinates.
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Numerical Analysis

Recursion and special sequences (Algebra II)+ 
Computer 
Lesson Plan 

[0]

This investigation illustrates the use of iteration, recursion and algebra to model and analyze a changing fish population. Graphs, equations, tables, and technological tools are used to investigate t...
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Graphical Analysis

Recursion and special sequences (Algebra II)+ 
Java Applet 
Lesson Plan 

[0]

This activity illustrates the use of iteration, recursion and algebra to model and analyze a changing fish population. Graphs, equations, tables, and technological tools are used to investigate the ef...
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Trout Population Grapher

Recursion and special sequences (Algebra II)+ 
Java Applet 
Tool 

[0]

The user can change the values of the initial population size, the yearly restocking amount, and the growth factor of the trout population in a pond, and then view the graph of the population size.
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Using Graphs, Equations, and T...

Recursion and special sequences (Algebra II)+ 
JavaScript 
Tool 

[0]

This threepart example illustrates the use of iteration, recursion, and algebra to model and analyze the changing amount of medicine in an athlete's body.
In Modeling the Situation, an i...
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Recursion

Recursion and special sequences (Algebra II) 
Java Applet 
Tool 

[0]

This activity graphs recursive functions of the form f(0) = C, defining f(n) based on f(n  1).
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Finding Reference Angles (Trig...

Reference Angles (Trigonometry) 
Flash 
Support Material 

[0]

This minilesson explains the reference angle and how to find the reference angle for a given angle.
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Dueling Pinwheels

Reflection (Geometry)+ 
Sketchpad 
Activity 

[0]

This contains construction directions for rotations, translation, and reflection, with questions to explore and a demonstration sketch to download at an introductory Sketchpad level.
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Transformations Lab

Reflection (Geometry)+ 
Sketchpad 
Activity 

[0]

This activity involves students using Sketchpad to explore reflections, translations, glide reflections, and rotations; it includes reference to a java applet as well.
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Transformations  Reflection

Reflection (Geometry) 
Java Applet 
Tool 

[0]

Dynamically interact with and see the result of a reflection transformation.
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Transformations  Reflection

Reflections (Math 4)+ 
Java Applet 
Tool 

[0]

With this virtual manipulative you can create objects with pattern block pieces and explore reflections as transformations of the plane.
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Composing Reflections

Reflections (Math 5)+ 
Java Applet 
Tool 

[0]

Users can examine the result of reflecting a shape successively through two different lines.
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Describing Reflections

Reflections (Math 6)+ 
Java Applet 
Tool 

[0]

Interacting with the JavaSketchpad applets helps the user understand how reflections work and what happens when two or more reflections are applied one after the other.
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Reflections Across Two Mirror ...

Reflections (Math 6)+ 
Java Applet 
Tool 

[0]

Users will learn what happens when a design is reflected twice across two different mirror lines with this interactive activity.
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Translations, Reflections, and...

Reflections (Math 7)+ 
Java Applet 
Lesson Plan 

[0]

An introduction to transformations.
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