TRIGONOMETRY 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). 

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. 

Odd Function  An Odd Function adheres to this property: f(x) = f(x). The standard sine function is an odd function. 

Omega  The last, or 24th, letter of the Greek alphabet is Omega. Uppercase Omega is used for ohms, a unit of electrical resistance. Lowercase Omega is used for angular velocity, a speed of rotation. 

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). 

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. 
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