parabola: Set of points equally distant from a focus and a directrix.
parallel: Two lines are parallel if they are in the same plane and never intersect.
parallelogram: A quadrilateral with opposite sides parallel.
parentheses: Marks of inclusion (symbols: ( and ) ). Parentheses is the plural form of parenthesis.
parenthesis: Marks of inclusion (symbols: ( and ) ).
pentagon: A five-sided polygon.
percent: A fraction or ratio in which the denominator is assumed to be 100 . The symbol % is used for percent.
perfect square: A whole number that is the square of an integer. Example: 16 is a perfect square because  .
perimeter: The sum of the lengths of the sides of a polygon.
periodic table: A tabular display of the chemical elements.
permutation: A way to arrange things in which order is important.
perpendicular: Two lines are perpendicular if the angle between them is  .
pH: A measure of the acidity or basicity of a solution.
Pi: The ratio of the circumference of a circle to its diameter (symbol: ,?p=31?p=22) equaling 3.1415926 ...
plane: A flat surface that stretches into infinity.
plane of symmetry: A plane that divides a 3-D object into two parts, each a mirror image of the other.
plot: To draw or graph a point on a number line or on a coordinate plane.
plus: Symbol indicating addition (symbol: + ).
pOH: Sometimes used as a measure of the concentration of hydroxide ions, OH-, or alkalinity.
point: A location in a plane or in space, having no dimensions.
point-slope equation of a line: An equation of the form SMB02cSMB03,?p=124?p=22) where m is the slope and SMB02cSMB03?p=67?p=22) is a point on the line.
polar: Expressed in terms of distance (from a point called the pole) and angle (with a ray as the initial side of the angle).
polyatomic ion: A charged species (ion) composed of two or more atoms covalently bonded or of a metal complex that can be considered as acting as a single unit in the context of acid and base chemistry or in the formation of salts.
polygon: A closed plane figure made up of several line segments that are joined together.
polyhedron: A three-dimensional solid that is bounded by plane polygons.
polynomial: An algebraic expression consisting of one or more summed terms, each term consisting of a constant multiplier and one or more variables raised to integral powers.
polynomial equation: An equation of the form P(x)=0 , where P(x) is a polynomial.
population: In statistics, population refers to the entire group about which data are being collected.
positive number: A real number greater than zero.
power: A number that indicates the operation of repeated multiplication.
prime: A natural number which has exactly two distinct natural number divisors: 1 and itself.
prime factorization: Calculation of all prime factors in a number.
principal: In business, the amount lent or borrowed.
prism: A geometric solid with two bases that are congruent, parallel polygons and all other faces are parallelograms.
probability: For an experiment, the total number of successful events divided by the total number of possible events.
product: The result of two numbers being multiplied together.
Product Rule: In calculus, the product rule (also called Leibniz's law) governs the differentiation of products of differentiable functions. It may be stated as: SMB04SMB01fSMB04*g+f*gSMB04SMB02cSMB03?p=134?p=22)
proper fraction: A fraction whose numerator is less than its denominator.
proportion: An equation of fractions in the form: 
proportional: A statement of equality in which each member is a fraction.
proton: A subatomic particle with an electric charge of +1 elementary charge.
protractor: A device for measuring angles.
pyramid: A three-dimensional figure that has a polygon for a base and all of the faces are triangles having a common vertex.
Pythagorean Theorem: The theorem that relates the three sides of a right triangle: 
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