# Math Dictionary o

O

Oblique line and a plane: A line and a plane that are neither parallel nor perpendicular.

Obtuse angle An angle whose measure is greater than 90 degrees and less than 180 degrees.

Obtuse triangle: A triangle having one obtuse angle.

Octagon: A polygon with 8 sides.

Octahedron: A polyhedron having eight faces. A regular octahedron is one of the five Platonic solids and has eight equilateral triangles as faces.

Odd number : Any integer that CANNOT be divided exactly by 2.

Odometer : An instrument (usually on the instrument panel of a car) that records distance traveled.
(A speedometer measures the current speed)

Ogive : It is also known as Frequency curve. It is used to find median of the data.

One-to-one function: A function where the inverse is also a function.

Operator : An Operator is a symbol (such as +, ×, etc) that represents an operation (i.e. you want to do something with the values).

Opposite rays: Two collinear rays whose intersection is exactly one point.

Opposite side in a right triangle: The side across from an angle. In a right triangle the hypotenuse is opposite the right angle and each leg is opposite one of the acute angles

Opposite transformation: A transformation of the plane that changes the orientation of a figure.

Order of Operations : The rules of which calculation comes first in an expression(PEDMAS).

Ordered pair: Two numbers that are used to identify the position of a point in a plane. The two numbers are called coordinates and are represented by (x, y).

Ordered triple: Three numbers that are used to identify the position of a point in space. The three numbers are called coordinates and are represented by (x, y, z).

Ordinal Number : A number that tells the position of something in a list.

Ordinate: The vertical coordinate of a two-dimensional rectangular coordinate system; usually denoted by y.

Orientation: The arrangement of the points, relative to one another, after a transformation; the reference made to the direction traversed (clockwise or counterclockwise) when traveling around a geometric figure.

Origin : The point in the Cartesian coordinate plane at which the horizontal and vertical axes intersect, designated by the ordered pair (0,0).

Orthocenter : The point of concurrence of the three altitudes of a triangle.

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