Nouns denoting two and three dimensional shapes

symmetry
balance among the parts of something
 
tetrahedron
any polyhedron having four plane faces
 
angularity
a shape having one or more sharp angles
 
asymptote
a straight line that is the limiting value of a curve; can be considered as tangent at infinity
 
wave
an undulating curve
 
cylinder
a surface generated by rotating a parallel line around a fixed line
 
triangle
a three-sided polygon
 
pillar
anything that approximates the shape of a column or tower
 
equipoise
equality of distribution
 
parallelogram
a quadrilateral whose opposite sides are both parallel and equal in length
 
brachium
(biology) a branching or armlike part of an animal
 
true anomaly
the angular distance of a point in an orbit past the point of periapsis measured in degrees
 
hyperbola
an open curve formed by a plane that cuts the base of a right circular cone
 
spherical triangle
a spherical polygon formed by the arcs of 3 great circles
 
crotchet
a sharp curve or crook; a shape resembling a hook
 
camber
a slight convexity (as of the surface of a road)
 
secant
a straight line that intersects a curve at two or more points
 
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
 
rhomboid
a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal
 
arc
something curved in shape
 
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