# Nouns denoting two and three dimensional shapes

- triangle
- something approximating the shape of a triangle

- spherical polygon
- a figure on the surface of a sphere bounded by arcs of 3 or more great circles

- regular polygon
- a polygon with all sides and all angles equal

- obtuse triangle
- a triangle that contains an obtuse interior angle

- hyperboloid
- a quadric surface generated by rotating a hyperbola around its main axis

- HA
- (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day

- radius
- a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)

- bight
- a bend or curve (especially in a coastline)

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

- catenary
- the curve theoretically assumed by a perfectly flexible and inextensible cord of uniform density and cross section hanging freely from two fixed points

- figure eight
- a two-dimensionsal figure having the shape of the number eight

- complex plane
- a geometric representation of the complex numbers established by the real axis and the orthogonal imaginary axis; it can be thought of as a modified Cartesian plane, with the real part of a complex number represented by a displacement along the x-axis, and the imaginary part by a displacement along the y-axis

- quadrate
- a square-shaped object

- loop
- anything with a round or oval shape (formed by a curve that is closed and does not intersect itself)

- Cupid's bow
- the double curve of the upper lip when considered to resemble Cupid's bow

- knot
- something twisted and tight and swollen

- ellipsoid
- a surface whose plane sections are all ellipses or circles

- cleft
- a split or indentation in something (as the palate or chin)

- scoop
- a hollow concave shape made by removing something

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

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