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Glossary
Basic Math
Pre-Algebra
Algebra
Trigonometry
Precalculus
Calculus
Math Glossary
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radian:
In
angle
measure
,
of a revolution.
radical:
A
root
sign (symbol:
).
radicand:
The number under the inclusion bar of the
radical
sign.
radius:
The
distance
from the center to a
point
on a
circle
; the line
segment
from the center to a
point
on a
circle
.
random:
A number chosen without definite aim, reason, or pattern.
range:
In
statistics
, the
difference
between the largest and the smallest numbers in a
data
set
.
rate:
A
ratio
that compares different kinds of
units
.
ratio:
A pair of numbers that compares different types of
units
.
rational expression:
The
quotient
of two
polynomials
.
rational number:
A number that can be expressed as the
ratio
of two
integers
.
ray:
Part of a line, containing one
endpoint
and extending to
infinity
in one direction.
reaction:
See chemical
reaction
.
real numbers:
The combined
set
of rational numbers and irrational numbers.
reciprocal:
The number which, when multiplied times a particular
fraction
, gives a result of
1
.
rectangle:
A
quadrilateral
with four
angles
.
reference angle:
In
trigonometry
, an acute
angle
which may be used as a reference or to compute the trigonometric
functions
of non-acute
angles
.
reflection:
A
transformation
resulting from a
flip
.
reflex angle:
An
angle
whose
measure
is between
and
.
regular polygon:
A
polygon
in which all the
angles
are equal and all of the sides are equal.
remainder:
The portion of the
dividend
that is not evenly
divisible
by the
divisor
.
repeating decimal:
A decimal in which the
digits
endlessly repeat a pattern.
rhombus:
A
parallelogram
with four equal sides.
right angle:
An
angle
whose
measure
is
.
right triangle:
A
triangle
that contains a right
angle
.
rise:
The
vertical
change between two
points
used to determine the
slope
of a line.
root:
The
root
of an
equation
is the same as the
solution
to the
equation
.
rotation:
A
transformation
in which a
figure
is rotated through a given
angle
, about a
point
.
run:
The
horizontal
change between two
points
used to determine the
slope
of a line.
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