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oblique angle
An angle that is neither a right, acute or
obtuse angle.
obtuse angle
An angle whose measure is greater than 90
degrees.
obtuse triangle
A triangle with an obtuse angle.
octagon
A polygon with 8 sides.
odd number
A whole number that is not evenly divisible
by 2.
odds
The ratio of the probability that an event
will occur compared with the probability of
it not occurring.
operation
Addition, subtraction, multiplication, and
division are the basic arithmetic operations.
operator
The symbol that expresses the operation to
be performed.
opposites
Two numbers that are located the same distance
from 0 on the number line but in opposite
directions. The sum of opposite numbers is
0.
ordered pair
Set of two numbers in which the order has
an agreed-upon meaning, such as the Cartesian
coordinates (x, y), where the first coordinate
represents the horizontal position, and the
second coordinate represents the vertical
position.
order of operations
A set of rules for the order in which to solve
mathematical problems. Start by multiplying
and dividing, then adding and subtracting,
always working within parenthesis first.
ordinal number
A number used to indicate place or position
within a set or group.
ordinate
The second element in a coordinate pair. When
graphed in the coordinate plane, it is the
distance from the x-axis. Frequently called
the y coordinate.
origin
The point (0, 0) on a coordinate plane, where
the x-axis and the y-axis intersect.
outcome
In probability, a possible result of an experiment.
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