Nouns denoting two and three dimensional shapes

truncated pyramid
a frustum formed from a pyramid
 
incidence angle
the angle that a line makes with a line perpendicular to the surface at the point of incidence
 
dodecahedron
any polyhedron having twelve plane faces
 
tesseract
the four-dimensional analogue of a cube
 
parallelogram
a quadrilateral whose opposite sides are both parallel and equal in length
 
conformation
a symmetrical arrangement of the parts of a thing
 
conic
(geometry) a curve generated by the intersection of a plane and a circular cone
 
circle
something approximating the shape of a circle
 
sine curve
the curve of y=sin x
 
rhomb
a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
 
dimple
any slight depression in a surface
 
anchor ring
a toroidal shape
 
secant
a straight line that intersects a curve at two or more points
 
snag
a sharp protuberance
 
score
a slight surface cut (especially a notch that is made to keep a tally)
 
crevice
a long narrow depression in a surface
 
tail end
any projection that resembles the tail of an animal
 
spiral
a plane curve traced by a point circling about the center but at increasing distances from the center
 
nonagon
a nine-sided polygon
 
rim
the shape of a raised edge of a more or less circular object
 
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