Title 
Description 

Parabola 
The graph of a quadratic function is a Parabola, a conic section.


Parallel Lines 
Coplanar Lines that never meet or cross are Parallel. If lines simply never cross, they may be skew (noncoplanar).


Parallel Planes 
Two distinct planes, collections of flat expansion of points, that never meet are considered Parallel Planes.


Parallel Postulate 
Given a line and a specific point not on the line, there is only one line through the specific point parallel to the given line.


Parallelepiped 
A shoebox is a Parallelepiped. Any geometric body with six faces that are each parallelograms that are in planes parallel to the opposite face.


Parallelogram 
A quadrilateral with two pairs of parallel sides is a Parallelogram; it has many dependable properties.


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


Parentheses 
Symbols ( ) serve to isolate or group written entities.


Partial Derivative 
The derivative with respect to a single variable is a Partial Derivative.


Partial Differential Equation 
A Differential Equation with a Partial derivative.


Partial Fraction 
A Fraction built from the decomposition of other terms.


Partial Sum 
A Partial Sum occurs when we sum only a finite number of terms from a larger or infinite series of terms.


Pascal's Triangle 
Pascal's Triangle is an important device for understanding binomial expansion and combinatorics.


Pentagon 
A fivesided polygon.


Percent 
Literally, per hundred.


Percentage 
Any reference to percent is a Percentage; the fraction of 100 a value represents.


Percentile 
Certain types of data lend themselves to description by what percent of the values exceed (or fall below) a specific data value. A Percentile states what percent of the data is less than the specific data value.


Perfect Square 
Most generally a Perfect Square is an integer that is the product of another integer times itself.


Perimeter 
The distance around the outside of a planar object or a plane figure is its perimeter.


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.


Permutation 
A specific order to the grouping of objects in a combination is termed a Permutation.


Perpendicular 
At right angles.


Perpendicular Bisector 
A line segment (or side of a polygon) has a unique line through its midpoint perpendicular to the line segment (or side). 

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


Phi 
The twentyfirst letter of the Greek alphabet.


Pi 
The constant ratio of circumference to diameter is represented by the 16th letter of the Greek alphabet; it is approximately 3.14159.


Piecewise 
Literally taken in sections or pieces.


Piecewise Continuous Function 
When a function is defined over an interval of the domain by different relations to the dependent variable we call it a Piecewise Continuous Function.


Plane 
An infinite expanse of points in two dimensions.


Plane Geometry 
Basic geometry is Plane Geometry. We hold to the parallel postulate and Euclidean principles.


Plus 
A symbol for addition, or the operation itself.


Point 
A location of infinitesimal size, that is, no size. A mathematical idea.


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.


Polynomial 
A series of terms (or a single term, a monomial), usually with at least one variable; terms are separated by plus signs or minus signs.


Population 
Statistically when we sample a Population we generally seek a representative sample. A Population is the group from which we take a sample.


Positive 
Real values are Positive when they are greater than zero.


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


Power 
Power most often means the value of an exponent.


Power Rule 
A simple device in calculus to determine the derivative of a monomial.


Precision 
The quality of finer measurement or estimation is termed Precision. 

Prime Factorization 
The process of finding the prime factors of a composite number is called Prime Factorization.


Prime Number 
A positive integer evenly divisible by itself and one but no other integers is considered a Prime Number.


Principal 
An amount, typically money, upon which the time value of money (accumulation of an added percentage over a defined time) generates interest is termed Principal.


Prism 
A Prism is a geometric solid with two congruent polygons within parallel bases connected by faces that are parallelograms.


Probability 
The likelihood of an event or particular outcome is its Probability. All Probabilities are between 0 and 1 (between zero percent and 100 percent).


Product 
The result of the operation of multiplication is called a Product.


Product Rule 
An algorithm within the calculus to find the derivative of the Product of two functions.


Projectile Motion 
Projectile Motion is a parabolic arc caused by gravity.


Proof 
An ingredient in pudding.


Proper Subset 
A set that is a subset of a given set and not identical to the given set is a Proper Subset of the given set.


Proportional 
In a (constant) ratio.


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


Pure Imaginary Number 
Given a complex number of the form a + bi, when a = 0 we say that the number is a Pure (or purely) Imaginary Number. 

Pyramid 
A geometric solid with a base of a polygon and planar lateral sides that meet at a point called an apex is termed a Pyramid.


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

Pythagorean Triple 
A series of three integers for whom the Pythagorean relation holds, as 345 or 51213, because 3² + 4² = 5² and 5² + 12² = 13².

