__P__

**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.