# GEOMETRY GLOSSARY

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Title Description
Oblique In one sense, at an angle or not perfectly horizontal or vertical.
An Oblique triangle is any triangle that is not a right triangle.
Obtuse In common language Obtuse means obscure and confusing, obfuscatory.
An Obtuse angle measures more than 90 degrees (and less than 180 degrees).
Octagon An eight-sided polygon.
Octant As we have four quadrants in the rectangular plane, we have eight Octants in rectangular space.
In three dimensions the three axes divide space into eight sections, each termed an Octant.
Odds The likelihood or probability of an event or specific outcome is termed the Odds of the event occurring.
Odds, or probabilities, are always represented with values between 0 and 1, or between zero and 100 percent (inclusively).
Omega The last, or 24th, letter of the Greek alphabet is Omega.
Upper-case Omega is used for ohms, a unit of electrical resistance.
Lower-case Omega is used for angular velocity, a speed of rotation.
One-Dimensional Linear, or along one line of direction.
Informally, constrained to stay along a narrow line.
Opposite Many meanings are found for Opposite, including having direction 180 degrees from an original direction, or having the negative sign of a previous sign.
Opposite real values have identical absolute values.
Ordered Pair Two coordinates are required to label a point in a plane, typically (x, y).
Ordered Triple Three coordinates are required to label a point in space, typically (x, y, z).
Origin In one dimension: (0).
In two dimensions: (0,0).
In three dimensions: (0, 0, 0).
Orthocenter The Orthocenter of a triangle is the point of concurrence of the altitudes of the triangle.
Orthogonal Most generally Orthogonal means perpendicular to a plane.
Oval In common language, any elliptical shape or not-quite round "circular" shape is called an Oval.
Mathematically, an ellipse is not an Oval.

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