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Title Description
Radian A Radian is an angle (measure) that subtends an arc length (on a circle) equal to the radius of the circle.
Radians are just as good as degrees for measuring angles, and sometimes better.
Radian Measure Radian Measure is just as good as degree measure for angles, and sometimes better.
Pi radians are equivalent to 180 degrees.
Radical A root symbol or the root itself is sometimes termed a Radical.
It is the distance from the center of a circle to any point on the circle.
Range We may speak of a Range of values as simply the difference between high and low values of a data set.
More specifically, the values generated by the input of domain values into a function map into the Range of values of the function.
Ratio Sometimes Ratio is meant to state a constant proportion.
More generally, the Ratio of two real values is the quotient of one number divided by the other.
Rational Expression Mathematical statements written as fractions with a numerator and a denominator are often termed Rational Expressions.
Recursive A Recursive formula or series has successive terms defined by operations or permutations on the term.
Reflexive Literally "in relation to itself." When we say A = A, we employ a Reflexive property.
Regression A statistical method of evaluating least-squares to find a best-fit line or curve to data.
Regression Line To find a best-fit linear relation with scatterplot data, we use Linear Regression to find a Regression Line.
Regular Polygon A Regular Polygon is both equilateral (all sides congruent) and equiangular (all angles congruent).
Relative Maximum Also a local Maximum, a high spot on the graph of a function.
It is the greatest value within a defined neighborhood.
Relative Minimum Also a local Minimum, a low spot on the graph of a function.
It is the least value within a defined neighborhood.
Revolutions Per Minute Abbreviated "rpm" it conveys the number of complete circular rotations that occur every 60 seconds at some constant rate of revolution.
Rho Lower-case Rho, the 17th letter of the Greek alphabet, is often used for density (mass per unit volume) in physics.
Right Angle An angle of 90 degrees or pi/2 radians.
Perpendicular lines meet at Right Angles.
Right Circular Cone A cone with a circular base and an apex directly above the center of the base.
Right Cone Any Cone, circular or otherwise, with its apex directly above the center of the base.
Right Triangle A triangle with a right angle.
Root Mean Square Abbreviated RMS it is the square root of the arithmetic mean of the squares of some real values, as from a data set.
Row Operations Arithmetic Operations on the Rows of a matrix to solve simultaneous equations.
Row-Echelon Matrix A Matrix upon which Row operations have been performed.

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