Nouns denoting two and three dimensional shapes

equilateral
a figure whose sides are all equal
 
hypotenuse
the side of a right triangle opposite the right angle
 
cylinder
a solid bounded by a cylindrical surface and two parallel planes (the bases)
 
geodesic
(mathematics) the shortest line between two points on a mathematically defined surface (as a straight line on a plane or an arc of a great circle on a sphere)
 
ellipsoid
a surface whose plane sections are all ellipses or circles
 
perversion
a curve that reverses the direction of something
 
cardioid
an epicycloid in which the rolling circle equals the fixed circle
 
angularity
a shape having one or more sharp angles
 
recess
a small concavity
 
isosceles triangle
a triangle with two equal sides
 
block
a three-dimensional shape with six square or rectangular sides
 
sphere
a three-dimensional closed surface such that every point on the surface is equidistant from the center
 
angular distance
the angular separation between two objects as perceived by an observer
 
exterior angle
the supplement of an interior angle of a polygon
 
wedge
any shape that is triangular in cross section
 
spherule
a small sphere
 
incisure
(anatomy) a notch or small hollow
 
frustum
a truncated cone or pyramid; the part that is left when a cone or pyramid is cut by a plane parallel to the base and the apical part is removed
 
ridge
any long raised strip
 
secant
a straight line that intersects a curve at two or more points
 
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