__S__

**Sampling
** A method used to estimate probability by selecting a
part of a larger group.

**Scalene
triangle **A triangle with no two sides congruent.

**Scientific
notation ** A method of
expressing a number as the product of a power of
10 and a number between

1
and 10.

**Sector
**(of circle) The region of a circle enclosed by two radii and the arc of the
circle cut off by the radii

**Segment
** *See *line
segment.

**Semicircle
** Half of a circle.

**Set
**A collection of distinct objects (2) **Sides
**(of angle) The rays which form the angle

**Sides
of a figure** The rays that form
an angle or the segments that form a polygon.

**Sides
of an equation ** The
mathematical expressions to the right and to the left of the equals sign.

**Sieve
of Erastosthenes **A method used to locate prime numbers less than a given
number

**Similar
figures ** Figures that have
the same shape but not necessarily the same size.

**Simple
closed curve **A closed curve whose representation meets itself only once, and
that is at the beginning point

**Simple
form **A mixed number is in simple form if its fractional part
is expressed in lowest terms.

**Simplify
an expression ** To replace
an expression with its simplest name.

**Sine
of an angle ** If *LA
*is an acute angle of a right triangle, the sine of *LA *sin A is the ratio of the length of the side opposite LA to the
length of the hypotenuse.

**Slope
of a line ** The steepness
of a line; that is, of the change in the y-coordinate to the change in the
x-coordinate when moving from one point on a line to another point.

**Solid
** An enclosed region of space bounded by planes.

**Solution
** A value of a variable that makes an equation or
inequality a true sentence.

**Solving
a** **right triangle ** The
process of finding the measures of the sides and angles of a right triangle.

**Sphere
**A figure in space made up of all points equidistant from a given point.

**Square
** A rectangle with all four sides congruent.

**Square
root of a number ** One of
the two equal factors of the number.

**Standard
form ** A way of writing
polynomials so that like terms are combined wherever possible, and the combined
terms are arranged so that powers of the variable decrease from left to right.

**Statistics
**The science of collecting, presenting, and interpreting data

**Statistical
measures ** Measures
including the range, mean, median, and mode used to analyze numerical data.

**Stem-and-leaf
plot ** A data display that
lists the last digits "leaves" of the data values to the right of the
earlier digits "stems".

**Straight
angle **An angle with a measure of 1800

**Supplementary
angles ** Two angles whose
measures have a sum of 180°.

**Surface
area ** The total area of a solid.

**Symmetric
** , A figure is
symmetric with respect to a line if it can be folded on that line so that every
point on one side

**System
of equations ** A
set of two or more equations in the same variables.

**System
of notation **The method of writing the numerals, or names of numbers

**System
of numeration **Each set of basic symbols and the rules for combining them to
name numbers