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 Absolute Value The distance of a number from zero on a number line. Since distance is always thought of as positive, the absolute value of any number is always positive. Acute Angle All angles whose measures are between 0 and 90 degrees. Angle A figure formed by two rays that share the same endpoint. Angle of Depression The angle formed between a horizontal line and an oblique line joined to some object below the horizontal. Angle of Elevation The angle formed between a horizontal line and an oblique line joined to some object above the horizontal. Area The number of square units required to cover a shape or figure. Axis of Symmetry A line, on which a figure can be folded, so that one side of the figure will become superimposed over the other side of the figure.             