**absolute value of a complex number** The length of the arrow representing the

complex number on the complex plane. If *z* = *a* + *bi*, then .

**acute angle** An angle with a measure less than 90°.

**amplitude of a periodic function** One half of the difference between the maximum and the minimum values of the function.

**angle** Two rays that share an endpoint.

**angle of depression** Angle by which an observer’s line of sight must be lowered from the horizontal to the point observed.

**angle of elevation** Angle by which an observer’s line of sight must be raised from the horizontal to the point observed.

**asymptote** A line that a curve approaches closer and closer ...

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