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Topic (Course) 
Technology 
Type 
$? 
Rating 

Radius of a Polygon  Math Ope...

Polygons (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that define and describe the radius of a regular polygon.
The applet has a polygon where the user can change the umber of sides and alter the radiu...
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Radius of a circle  Math Open...

Radius (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the radius of a circle.
The applet shows a circle with a radius line.
The radius endpoints are draggable and the figure changes ...
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Radius of an Arc  Math Open R...

Radius (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that describe the radius of an arc and how to derive it from the width and height of the
segment defined by that arc. A practical use is described fo...
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Raindrops

Measurement (Math 7)+ 
Java Applet 
Tool 

[0]

With this applet, students can investigate the probabilities of catching different amounts of raindrops using differentlysized and placed buckets. This investigation helps give students a sense of t...
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Random

Probability (Math 6)+ 
Flash 
Tool 

[0]

Discover that randomness is a process in which the outcomes of an experiment all have the same chance of happening. This resource includes a lesson, simulation, and question set.
More: lessons, discussions, ratings, reviews,...

Random Drawing Tool

Probability (Math 6)+ 
Java Applet 
Tool 

[1]

This tool allows users to explore the relationship between theoretical and experimental probabilities. A "box model" is a statistical device that can be used to simulate standard probability experimen...
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Random Number Generation

Displaying with Graphs (Probability & Statistics)+ 
Java Applet 
Activity 

[0]

This activity describes the need, the general methods and the SOCR utilities for random number generation and simulation. SOCR Modeler allows interactive sampling from any SOCR Distribution. The simu...
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Random Number Generators Dialo...

Probability (Math 6)+ 
Calculator 
Support Material 

[0]

Different methods for random fair choice between several numbers.
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Random Numbers from the Home S...

Randomness (Probability & Statistics) 
TI82 
Activity 

[0]

A guide to generating pseudorandom numbers in specified ranges on your TI82 (with a note about the TI83 version). Includes practice questions for students, with answers.
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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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Random Trigonometry Problems

Solving Triangles (Trigonometry) 
Flash 
Tool 

[0]

This tool generates trigonometry problems for practice, and shows the answer with working out at the student's request.
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Random Walk: 1D

Simulations (Math 7)+ 
Java Applet 
Tool 

[1]

Students learn about randomness and the mean squared distance and how they are related in this applet about taking a random walk in one dimension (along one axis).
More: lessons, discussions, ratings, reviews,...

Random Walk: 2D

Simulations (Math 7)+ 
Java Applet 
Tool 

[0]

Learn more about randomness and the mean squared distance and how they are related with this applet about taking a random walk in two dimensions.
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Randomizer

Randomness (Probability & Statistics) 
JavaScript 
Tool 

[0]

This applet randomizes a given set of numbers defined by the user.
More: lessons, discussions, ratings, reviews,...

Randomness of Prime Numbers

Prime (Math 6)+ 
JavaScript 
Tool 

[0]

Talking about how prime numbers are apparently distributed at 'random' can be visualized by this script. Enter a reasonable target number and the script will show a "" symbol for the primes in the se...
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Randomness of Prime Numbers

Prime (Math 7) 
JavaScript 
Story 

[0]

Jeff LeMieux, writes about how he uses the JavaScript page, Randomness of Prime Numbers, with his students.
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Rate

Rates (Math 5)+ 
Flash 
Tool 

[0]

Understand that rate compares two quantities of different kinds of units and learn how to express rates as unit rates. This online lesson includes an interactive activity and assessment question set.
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Ratio (Amsco Integrated Algebr...

Ratios (Math 7) 
Flash 
Support Material 

[0]

This minilesson explains ratios, equivalent ratios, and continued ratios.
More: lessons, discussions, ratings, reviews,...

Ratio Test

Ratio test (Calculus) 
Computer 
Support Material 

[0]

Defines the Ratio Test for convergence of an infinite series.
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Ratio Test

Ratio test (Calculus) 
Flash 
Tool 

[0]

Technical discussion of the reasoning behind the Ratio Test.
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Ratio Test

Ratio test (Calculus) 
Java Applet 
Tool 

[0]

Technical discussion of the reasoning behind the Ratio Test.
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Ratio and Proportion

Ratio and proportion (Math 4)+ 
Flash 
Tool 

[1]

This module's aim is to remind learners about simple ratio and direct proportion, using factsheets, worksheets, an activity, a game, and a quiz at multiple difficulty levels.
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Ratio of Monomials and Polynom...

Polynomials (Algebra)+ 
Flash 
Support Material 

[0]

This minilesson explains the concept of a ratio as a way of comparing a pair of numbers or variables.
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Rational Equations Visualizer

Horizontal shift (Algebra II)+ 
Java Applet 
Tool 

[2]

Explore how the parameters in a rational equation affect the graph of the equation. Dynamically change the parameters and immediately see how the graph changes. Undefined points are clearly visible....
More: lessons, discussions, ratings, reviews,...

Rational Exponents

Rational (Algebra) 
Flash 
Tool 

[0]

Flashbased introduction to fractional exponents. College Cram charges access fees by the month or by the semester for most resources. To get a preview of their tools, see their free math modules.<...
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