ADVANCED ALGEBRA GLOSSARY

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