Dictionary
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 sector
 A piece of an object. In the spinner, any of the numbered segments is a
"sector"
(cf From Geometry to Probability Discussion).
 selfsimilarity
 Two or more objects having the same characteristics. In fractals, the shapes of lines at different iterations look like smaller versions of the earlier shapes
(cf SelfSimilarity Discussion).
 sequence
 An ordered set whose elements are usually
determined based on
some function of the counting numbers.
 set
 A set is a collection of things, without regard to their order (cf Internet Search and Set Operations Discussion).
 significant digits
 The number of digits to consider when using measuring numbers.
There are three rules in determining the number of digits considered significant in a number.
1) All nonzeros are significant.
2) Any zeros between two nonzeros are significant
3) Only trailing zeros behind the decimal are considered significant
 slope of the linear function
 The slope of the line y = mx + b is the rate at which y is changing per unit of change
in x. The units of measurement of the slope are units of y per unit of x
(cfLinear Functions
Discussion).
 square
 A parallelogram with four congruent
sides and four right angles (cfRectangle Discussion).
 standard deviation
 Standard deviation tells how spread out numbers are from the average, calculated by
taking the square root of the arithmetic average of the squares of the deviations
from the mean in a frequency distribution (cf The Normal Distribution Discussion).
 subset
 A subset of a given set is a collection of things that belong to the original set. For example, A={a,b} could include, a, b, a and b, or the null set (neither).
 subtraction
 The operation in which the difference between two
numbers or quantities is calculated. Also, the inverse of addition (cf Integer Addition and Subtraction Discussion,
Fraction Adding and Subtracting Discussion).
 superscript
 In mathematics, superscripts are numbers or letters written above and to the right
of other numbers or letters or symbols indicating how many times the latter is to be used
as a factor. When typing, one can represent a superscript by using the ^ symbol to
indicate raising the number. For example, x^{3} is the same as x^3, which
equals x * x * x
(cf Trees as Data Structures Discussion).
 surface area
 A measure of the
number of square units needed to cover the outside of a figure
(cfSurface Area and Volume
Discussions).
 symmetry
 The correspondence in size, form, or arrangement of parts on a plane or line. In line symmetry, each point on one side of the line has a corresponding point on the opposite side of the line (picture a butterfly, with wings that are identical on either side). Plane symmetry refers to similar figures being repeated at different but regular locations on the plane (cfSymmetry in Tessellations Discussion).
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