490S
scale The numbers along an axis of a
graph; the ratio of a pictured measure to
the actual measure; the tool used to mea-
sure weight.
scalene triangle A triangle with no sides
that are equal in length.
side A line segment that forms part of a
polygon.
similar figures Figures that have the same
shape. They may or may not be the same
size.
simple closed curve A path that begins
and ends at the same point and does not
cross itself.
slide (translation) The movement of a
figure along a line without changing
direction.
solid figure A figure that is not flat, but
that has volume; a solid figure is three-
dimensional.
sphere A solid figure shaped like a ball.
square A parallelogram that has four right
angles and four congruent sides.
square pyramid A pyramid with a square
base.
straight angle An angle that measures 180°.
subtrahend A number that is subtracted
from another number.
survey A way to collect data to answer a
question.
T
temperature The measure of how cool or
warm something is.
thermometer An instrument used to mea-
sure temperature.
ton (T) A customary unit of weight;
2000 pounds 1 ton.
trapezoid A quadrilateral with exactly one
pair of parallel sides.
triangle A polygon with three sides.triangular prism A solid figure with two
parallel triangular faces.
turn (rotation) The movement of a figure
around a point.
turn image The result of a turn (or rotation)
of a figure.
U
unlike denominators Denominators that
are not the same in one or more fractions;
the fractions^18 and ^17 have unlike
denominators.
V
variable A letter or other symbol that
replaces a number in an expression,
equation, or inequality.
vertex A common endpoint of two rays or
line segments. In a solid figure, the point at
which three or more edges meet.
volume The number of cubic units needed
to fill a solid figure.
W
whole number Any of the numbers 0, 1, 2,
3, 4,...
X
x-axis (horizontal axis) The horizontal
number line on a coordinate grid.
x-coordinate The number that tells how
many spaces to move horizontally along
the x-axis; in the ordered pair (1, 2), 1 is
the x-coordinate.
Y
y-axis (vertical axis) The vertical number
line on a coordinate grid.
y-coordinate The number that tells how
many spaces to move vertically along the
y-axis; in the ordered pair (1, 2), 2 is the
y-coordinate.
Z
zero (identity) property of addition The
sum of zero and a number is that number.
zero property of multiplication The
product of zero and a number is zero.8204-6_486-490 4/16/07 9:28 PM Page 490