Parallel lines Lines in the same plane that do not intersect.

Parallel planes Two or more planes that will never intersect

Parallelogram  A quadrilateral  with both pairs of opposite sides parallel.

Percent   A ratio of a number to 100, shown by the symbol %.

Percent of change   The amount of change divided by the original amount.                                                                                                                        

Percentage   The number that results from taking a percent of another number.

Perfect square   A number whose square root is an integer.

Perimeter   The distance around a plane figure.

Permutation   An arrangement of a group of things in a particular order.

Perpendicular bisector The line perpendicular to a line segment which divides the line segment into two congruent segments

Perpendicular lines   Two lines that intersect to form four right angles.

  Pi (o) The ratio of the circumference of a circle to its diameter

Pictograph A picture graph

Place value The value of the position of a digit in a numeral

Plane   A flat surface extending infinitely in all directions.

Plane figure A geometric figure all of whose points are in one plane

Point   The simplest figure in geometry, representing an exact location. A point has no dimensions or size. 

It has only a position or location.  The idea of a point is represented by a dot and is usually named by a capital letter

Polygon   A closed plane figure made up of line segments.

Polyhedron   A three-dimensional figure formed of polygonal parts of planes.

Polynomial   A sum of terms involving nonnegative integer powers of a variable.

Power The product of equal factors

Precision The smallest unit of measure used when measuring an object

Prime factorization Factoring a composite number into prime numbers

Prime number A whole number greater than I that has only two whole number factors, itself and .

Principal An amount of money on which interest is paid.

Prism   A polyhedron that has two parallel, congruent faces called bases.  The other faces are parallelograms.

Probability  The ratio of the number of outcomes favoring an event to the total number of possible outcomes.

Product The answer to a multiplication problem

Proper fraction A positive fraction whose numerator is less than its denominator, or the opposite of such a fraction.

Property of one for division For each number, the quotient of the number divided by one is the number. 

Or, for each number

Property of one for multiplication For each number, the product of the number and one is the number. 

Or, for each number

 Property of zero for addition For each number, the sum of the number and zero is the number.  Or,

 for each number

Property of zero for multiplication For each number, the product of the number and zero is zero.  Or, f

or each number

Proportion   An equation stating that two ratios are equal.

Protractor   A device used to measure angles.

Pyramid   A polyhedron that has a polygonal base and three or more triangular faces.

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