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radian
In angle measure, 2*Pi of a revolution.
radical
A root sign.
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.
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 90 degree 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 180 degrees
and 360 degrees.
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 90 degrees.
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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