# 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).
Polar-Rectangular 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 far-reaching 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 (next-to-last) of the Greek alphabet.
Pythagorean Identities sin²x + cos²x = 1; 1 + tan²x = sec²x; 1 + cot²x = csc²x

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