TRIGONOMETRY GLOSSARY

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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.
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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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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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Ray A set of collinear points, a Ray has an endpoint and proceeds infinitely far in a single direction.
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Rectangular-Polar Conversion A simple algorithm to change (x, y) into (r, theta).
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Reference Angle In standard position, any angle in quadrants II, III, or IV has a Reference Angle equal to the acute angle made with the x-axis.
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Regular Polygon A Regular Polygon is both equilateral (all sides congruent) and equiangular (all angles congruent).
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Regular Right Prism A Prism with bases of Regular polygons and lateral faces perpendicular to those bases.
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Regular Right Pyramid A Pyramid with a Regular polygon for a base and an apex directly above the center of the base.
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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 Circular Cylinder A circular cylinder with sides orthogonal to parallel bases. Play_video
Right Cone Any Cone, circular or otherwise, with its apex directly above the center of the base.
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Right Cylinder Any Cylinder, circular or otherwise, with lateral sides orthogonal to the bases.
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Right Prism A Prism with lateral sides orthogonal to the bases.
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Right Pyramid A Pyramid with its apex directly above the center of the base.
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Right Regular Prism A Prism with bases of Regular polygons and lateral faces perpendicular to the bases.
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Right Regular Pyramid A Pyramid with a Regular polygon for a base and an apex directly above the center of the base.
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Right Square Parallelepiped Cube. Play_video
Right Square Prism A cube, or a shoebox if the ends of the shoebox are square.
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Right Triangle A triangle with a right angle.
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Rotation Movement in a circulation or circular fashion, often around a point or an axis, is termed Rotation.
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