# Definitions

The following figures show the various geometrical forms and their definitions:

151.

*Abscissa.*—The point in a curve, A, which is referred to by certain lines, such as B, which extend out from an axis, X, or the ordinate line Z.

152.

*Angle.*—The inclosed space near the point where two lines meet.

153.

*Apothegm.*—The perpendicular line A from the center to one side of a regular polygon. It represents the radial line of a polygon the same as the radius represents half the diameter of a circle.

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154 *apsides* Or *apsis*
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Signs To Indicate Measurements
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