Nouns denoting two and three dimensional shapes

hexagram
a regular polygon formed by extending each of the sides of a regular hexagon to form two equilateral triangles
 
prism
a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms
 
hoodoo
(geology) a column of weathered and unusually shaped rock
 
subfigure
a figure that is a part of another figure
 
recession
a small concavity
 
convex shape
a shape that curves or bulges outward
 
round shape
a shape that is curved and without sharp angles
 
regular octahedron
an octahedron with eight equilateral triangles as faces
 
reflex angle
an angle greater than 180 degrees (but less than 360)
 
parallel
(mathematics) one of a set of parallel geometric figures (parallel lines or planes)
 
jog
a sharp change in direction
 
decagon
a polygon with 10 sides and 10 angles
 
critical angle
the smallest angle of incidence for which light is totally reflected
 
sine curve
the curve of y=sin x
 
cutting angle
the angle between the face of a cutting tool and the surface of the work
 
tangent
a straight line or plane that touches a curve or curved surface at a point but does not intersect it at that point
 
rhombohedron
a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)
 
concave polygon
a polygon such that there is a straight line that cuts it in four or more points
 
radius
a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
 
concavity
a shape that curves or bends inward
 
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