# Nouns denoting two and three dimensional shapes

- element of a cone
- a straight line joining the apex and a point on the base
- prism
- a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms
- cylinder
- a surface generated by rotating a parallel line around a fixed line
- 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
- proportion
- balance among the parts of something
- droop
- a shape that sags
- pellet
- a small sphere
- quadrate
- a square-shaped object
- perversion
- a curve that reverses the direction of something
- camber
- a slight convexity (as of the surface of a road)
- cladogram
- a tree diagram used to illustrate phylogenetic relationships
- natural shape
- a shape created by natural forces; not man-made
- right angle
- the 90 degree angle between two perpendicular lines
- oval
- a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it
- oblique angle
- an angle that is not a right angle or a multiple of a right angle
- critical angle
- the smallest angle of incidence for which light is totally reflected
- view angle
- the angle included by a photographic lens
- octagon
- an eight-sided polygon
- knife
- any long thin projection that is transient
- altitude
- the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel)