LINE SEGMENTS
- Open line segments
- closed line segments
- chord , A chord (from the Latin chorda, meaning bowstring) of a circle is a straight line segment whose endpoints both lie on a circular arc.
- diagonal , a diagonal is a line segment joining two vertices of a polygon or polyhedron, when those vertices are not on the same edge.
- diameter , a diameter of a circle is any straight line segment that passes through the centre of the circle and whose endpoints lie on the circle.
- edge , an edge is a particular type of line segment joining two vertices in a polygon, polyhedron
- half open line segments
line to plain or plain to solid
angular
 | middle | Between angles | DIAGONAL. |
 | extemity | SIDE. |
Round
| English word | Latin or greek | ||
|---|---|---|---|
 | Round; externally touching | TANGENT. | |
 | Round; externally cutting | SECANT. | |
 | Round : intenally - central - side to side - | Ray. | DIAMETER, |
 | Round ( internally - central - pole to pole ) | AXIS. | |
 | Round : intenally - not central - periphery to diameter | SINE. | |
 | Round ( internally - not central - periphery to periphery ) | CHORD. |
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