Nouns denoting two and three dimensional shapes

cardioid
an epicycloid in which the rolling circle equals the fixed circle
 
teardrop
anything shaped like a falling drop (as a pendant gem on an earring)
 
spherical angle
an angle formed at the intersection of the arcs of two great circles
 
cavity
space that is surrounded by something
 
contortion
a tortuous and twisted shape or position
 
shapelessness
an amorphous or indefinite shape
 
base
the bottom side of a geometric figure from which the altitude can be constructed
 
star
a plane figure with 5 or more points; often used as an emblem
 
paraboloid
a surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis
 
entasis
a slight convexity in the shaft of a column; compensates for the illusion of concavity that viewers experience when the sides are perfectly straight
 
prismatoid
a polyhedron whose vertices all lie in one or the other of two parallel planes; the faces that lie in those planes are the bases of the prismatoid
 
orbital plane
(astronomy) the plane on which a body is orbiting
 
camber
a slight convexity (as of the surface of a road)
 
pentagon
a five-sided polygon
 
altitude
the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel)
 
hypocycloid
a line generated by a point on a circle that rolls around inside another circle
 
curved shape
the trace of a point whose direction of motion changes
 
Cartesian plane
a plane in which all points can be described in Cartesian coordinates
 
angle of view
the angle included by a photographic lens
 
equator
a circle dividing a sphere or other surface into two usually equal and symmetrical parts
 
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