scalar:  a quantity that has size but no direction.

scalene triangle:  a triangle with three unequal sides.

secant:  a line that intersects a circle or a curve in two places.

secant:  the reciprocal of the cosine.

second:  the unit of measure of an angle that is 1/60 of a minute.

sector:  a region bounded by two radii of a circle and the arc whose endpoints lie on those


segment:  the union of a point, A, and a point, B, and all the points between them.

series:  the sum of a sequence.

set:   a well defined group of objects.

similar:  two polygons are similar if their corresponding sides are proportional.

simoultaneous equations:  a group of equations that are all true at the same time.

sine:  in a right triangle, the length of a side opposite an angle divided by the length of the

skew:   two lines that are not in the same plane.

slope:   the slope of a line is the change in the vertical coordinates/the change in the

              horizontal coordinates of any two points on the line.

solid:   a three dimensional object that completely encloses a volume of space.

sphere:   the set of all points in space that are a fixed distance from a given point.

square:   a quadrilateral with four equal sides and four 90 degree angles.

square root:   of a number, x, is the number that, when multiplied by itself gives the

                       number, x.

subset:   A set, B, is a subset of another set, A, if every element in B is also an element of


sum:   the result of adding.

supplementary:  two angles are supplementary if their sum is 180 degrees.

symmetric:   two points are symmetric with respect to a third point if the segments joining

                    them to the third point are equal.   Two points are symmetric with respect to a

                     line if the line is the perpendicular bisector of the segment joining the points.