# Nouns denoting two and three dimensional shapes

- truncated pyramid
- a frustum formed from a pyramid

- incidence angle
- the angle that a line makes with a line perpendicular to the surface at the point of incidence

- dodecahedron
- any polyhedron having twelve plane faces

- tesseract
- the four-dimensional analogue of a cube

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

- conformation
- a symmetrical arrangement of the parts of a thing

- conic
- (geometry) a curve generated by the intersection of a plane and a circular cone

- circle
- something approximating the shape of a circle

- sine curve
- the curve of y=sin x

- rhomb
- a parallelogram with four equal sides; an oblique-angled equilateral parallelogram

- dimple
- any slight depression in a surface

- anchor ring
- a toroidal shape

- secant
- a straight line that intersects a curve at two or more points

- snag
- a sharp protuberance

- score
- a slight surface cut (especially a notch that is made to keep a tally)

- crevice
- a long narrow depression in a surface

- tail end
- any projection that resembles the tail of an animal

- spiral
- a plane curve traced by a point circling about the center but at increasing distances from the center

- nonagon
- a nine-sided polygon

- rim
- the shape of a raised edge of a more or less circular object

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