TRIGONOMETRY GLOSSARY
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Title  Description  

Parametric Equation  In a general sense, we have a Parametric Equation when we define something in specific terms of something else. 

Period  Measured in time, or angle, or even sometimes distance, the Period of a repetitive function is the time (or angle or distance) it takes to complete a cycle. 

Periodic  Functions that repeat a cycle over and over again are considered Periodic. 

Perpendicular  At right angles. 

Phase Shift  This applies to sinusoids moved left or right by a change to the argument (the angle). 

Plane  An infinite expanse of points in two dimensions. 

Point  
Polar Complex Number  We may express complex numbers in trigonometric form. 

Polar Coordinates  In labeling a point in a plane we need two coordinates. In Polar Coordinates we use a radius and an angle, as (r, theta). 

PolarRectangular Conversion  An algorithm for changing (r, theta) to (x, y). 

Polygon  A closed plane figure with straight sides. 

Polyhedron  A geometric solid with faces that are polygons. 

Postulate  A farreaching conjecture or sense of reasoning for which an obvious and substantive base appears most reasonable. 

Precision  The quality of finer measurement or estimation is termed Precision.  
Projectile Motion  Projectile Motion is a parabolic arc caused by gravity. 

Proportional  In a (constant) ratio. 

Psi  The 23rd letter (nexttolast) of the Greek alphabet. 

Pythagorean Identities  sin²x + cos²x = 1; 1 + tan²x = sec²x; 1 + cot²x = csc²x 
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