# 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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