line segment
part of a line that is bounded by two distinct end points; line with two endpoints
sagitta
the distance from the center of the arc to the center of its base
semidiameter
term in geometry; half of a shape's diameter
scale marking
marks used to indicate points on a visual scale according to a law
stability radius
type of radius
semi-axis
term in geometry; longest and shortest semidiameters of an ellipse
semi-minor axis
shortest interval from a point on an ellipse to its center
side
line segment joining two adjacent vertices in a polygon or polytope
diameter
straight line segment that passes through the center of a circle
radius
segment in a circle or sphere from its center to its perimeter or surface and its length
diagonal
line segment joining two nonconsecutive vertices of a polygon or polyhedron
semi-major axis
longest interval from a point on an ellipse to its center
chord
geometric line segment whose endpoints both lie on the curve
apothem
segment from the center of a polygon to the midpoint of one of its sides
transect
path along which the observer counts and records occurrences of the subjects of the survey
baseline
survey line