# Nouns denoting two and three dimensional shapes

- annulus
- a toroidal shape

- extrados
- the exterior curve of an arch

- pentahedron
- any polyhedron having five plane faces

- angularity
- a shape having one or more sharp angles

- parallelogram
- a quadrilateral whose opposite sides are both parallel and equal in length

- hexagram
- a regular polygon formed by extending each of the sides of a regular hexagon to form two equilateral triangles

- impression
- a concavity in a surface produced by pressing

- dogleg
- angle that resembles the hind leg of a dog

- knife
- any long thin projection that is transient

- prism
- a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms

- pit
- a concavity in a surface (especially an anatomical depression)

- ruck
- an irregular fold in an otherwise even surface (as in cloth)

- S-shape
- a double curve resembling the letter S

- view angle
- the angle included by a photographic lens

- spherical angle
- an angle formed at the intersection of the arcs of two great circles

- angle
- the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians

- bifurcation
- a bifurcating branch (one or both of them)

- complementary angles
- two angles whose sum is a right angle

- spherule
- a small sphere

- convex polyhedron
- a polyhedron any plane section of which is a convex polygon

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