Page 222 - Mathematics GRADE 9, DE-STREAMED (MTH1W)

subset
A smaller set within a set. For example, the set of whole numbers is a subset of the set of integers. See also set.
symmetry
The geometric property of being balanced about a point, a line, or a plane.
term
A single number, variable, or combination of numbers and variables involving no addition or subtraction.
three-dimensional object
An object that has the dimensions of length, width, and depth.
transformation
A change in a set of points that results in a different position on a coordinate system. Transformations include translations, reflections, rotations, and dilations.
translation
A transformation that moves every point in a set the same distance, in the same direction.
unit
A quantity used as a standard of measurement.
unit fraction
Any fraction that has a numerator of 1, for example, 12, 13, or 14. Every fraction can be decomposed into unit fractions. For example, 3 is 3 one-fourth units, or 3 = 1 + 1 + 1.
variable
A symbol, letter, or words representing a value that can vary depending on the context. For example, in an equation x + y = 3, if the variable x changes, the value of variable y will change accordingly. In coding, words are often used instead of a letter, such as FirstNumber + SecondNumber = 3. In coding, a variable is a temporary storage location for data such as a numerical value or a series of characters, and the values stored in that location vary depending on the commands given by the program. In a data set, a variable such as height may take on a different value for each member of a population.
x-intercept
The value of x for a point (x, y) on the x-axis when y is zero. y-intercept
The value of y for a point (x, y) on the y-axis when x is zero. 221
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