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Glossary Term rectangular prism Definition A solid figure that has two pairs of parallel opposite faces and congruent bases that are all rectangles. recursive formula A formula used for determining the next term of a sequence using one or more of the previous terms. The subset of a sample space that contains only those outcomes that satisfy a given condition. The acute angle formed by the terminal side of an angle in standard position and the x-axis. A transformation in which a figure is flipped over a line of symmetry. reduced sample space reference angle reflection regression line regular polygon A line of best fit. A polygon that has all sides congruent and all angles congruent. regular polyhedron A polyhedron in which the faces are regular congruent polygons. regular prism regular pyramid A right prism with bases that are regular polygons. A pyramid whose base is a regular polygon and in which the segment from the vertex to the center of the base is the altitude.