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Glossary Term back-to-back stem-andleaf plot bar graph bar notation base angles of an isosceles triangle Definition Used to compare two sets of data. The leaves for one set of data are on one side of the stem, and the leaves for the other set of data are on the other side. A graph that compares different categories of data by showing each category as a bar whose length is related to the frequency. In repeating decimals, the line or bar placed over the digits that repeat. Example: 2.63636363… = 2. 63 . The equal angles formed by the base and the congruent sides of an isosceles triangle. base angles of a trapezoid The pairs of angles of a trapezoid with their vertices at the endpoints of the same base. base in a percent proportion base of a threedimensional figure base of an expression base of an isosceles triangle The number to which the percentage is compared. The faces on the top and bottom of the figure. In an expression of the form xn, the base is x. The side opposite the vertex angle.