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 Radical a root sign Radius Half the diameter of a circle. The distance between the middle of a circle and the circles surface. Random Number A number choosed without definite aim, reason, or pattern. Ratio The number or degree of one class of things in relation to another, or between one thing and another, expressed as a proportion . Example: In a car, the ratio of tires to steering wheel is 4 to 1, often wriiten 4:1. Ray a line having one endpoint Real Number any number that is not imaginary Example: "1.23156..., 5, 8/6, e, square root (3)" Reciprocal Expressions, relations, or fractions that are opposite. Example: 1/2 is the reciprocal of 2/1 Rectangle A parallelogram with four right angles. Rectangular Prism A prism in the shape of a rectangle. Regular Polygon a polygon with all sides equal and all interior angles congruent Remainder The portion of the dividend that is not evenly divisible by the divisor. Rhombus An equilateral parallelogram with oblique angles. Right Angle An angle that is 90 degrees. Right Triangle A triangle with one of the angles equal to 90 degrees.  