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random number generators
A device used to produce a selection of numbers in a fair manner, in no particular order and with no favor being given to any numbers. Examples include dice, spinners, coins, and computer programs designed to randomly pick numbers
range
The range of a set of numbers is the largest value in the set minus the smallest value in the set. Note that the range is a single number, not many numbers
range of the function f
The set of all the numbers f(x) for x in the domain of f
ratio
A rational number of the form a/b where a is called the numerator and b is called the denominator
ray
A straight line that begins at a point and continues outward in one direction
real numbers
Real numbers can be thought of as all the points falling along the number line in the coordinate plane
rectangle
A parallelogram with four right angles
recursion
Given some starting information and a rule for how to use it to get new information, the rule is then repeated using the new information
reflect
In a tessellation, reflect means to repeat an image by flipping it across a line so it appears as it would in a mirror
regular fractals
see fractal
regular polygon
A polygon whose side lengths are all the same and whose interior angle measures are all the same
relative frequency
Relative frequency is the number of items of a certain type divided by the number of all the numbers being considered
remainders
After dividing one number by another, if any amount is left that does not divide evenly, that amount is called the remainder. For example, when 8 is divided by 3, three goes in to eight twice (making 6), and the remainder is 2. When dividing 9 by 3, there is no remainder, because 3 goes in to 9 exactly 3 times, with nothing left over
residual
The observed value minus the predicted value. It is the difference of the results obtained by observation, and by computation from a formula.
rhombus
A parallelogram with four congruent sides
right angle
An angle of 90 degrees
right triangle
A triangle containing an angle of 90 degrees
rotate
To rotate an object in a tessellation means to repeat the object by spinning it on a point a certain angle
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