locus
set of points whose location satisfies or is determined by one or more specified conditions
line segment
part of a line that is bounded by two distinct end points; line with two endpoints
semicircle
geometric shape
equipotential
region in space consisting of points at the same potential
Regulus
surface in three-dimensional space
open cylinder
does not include either top or bottom elements, and therefore has surface area (lateral area) L = 2πrh
angle bisector
division of an angle into two angles with equal measures
point
fundamental object of geometry: locus within which we can distinguish no other locus than itself
ray
line with one endpoint
line
general concept of a line (curved or straight)
plane
flat, infinite two-dimensional surface
line
one-dimensional infinite non-curved geometric object
wavefront
locus of points at equal phase in a wave
datum reference
feature of reference (point, line, plane, hole, set of holes, or pair of surfaces) against which some others are calculated
exterior
term in topology
radical axis
line determined by two circles
parabola
plane curve: symmetrical conic section
geometric primitive
basic shapes represented in vector graphics
generalised circle
curve that is a circle or a straight line
circle
simple curve of Euclidean geometry
interior
given a subset S of a topological space X, the biggest set of points in S not part of the boundary of S
ellipse
ellipse in descriptive geometry
ellipse
ellipse in descriptive geometry
quadric surface
locus of zeros of a quadratic polynomial in a three-dimensional space (affine or projective, not necessarily real)
curve
mathematical idealization of the trace left by a moving point
intersection (geometry)
point, line, or curve common to two or more objects such as lines, curves, planes, and surfaces
perpendicular bisector
line segment bisector passes through the midpoint of the segment at right angles
sphere
round, rotationally symmetric shape of the 2D surface of a ball in 3D space
conic section
curve obtained by intersecting a cone and a plane
shape
form of an object or its external boundary
equidistant
point that is at the same distance to every object in a given set