# Nouns denoting two and three dimensional shapes

- regular tetrahedron
- a tetrahedron with four equilateral triangular faces

- curlicue
- a round shape formed by a series of concentric circles (as formed by leaves or flower petals)

- box
- a rectangular drawing

- belly
- a part that bulges deeply

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

- polygon
- a closed plane figure bounded by straight sides

- chord
- a straight line connecting two points on a curve

- disproportion
- lack of proportion; imbalance among the parts of something

- interior angle
- the angle inside two adjacent sides of a polygon

- spur
- any sharply pointed projection

- orbital plane
- (astronomy) the plane on which a body is orbiting

- tree diagram
- a figure that branches from a single root

- undecagon
- an eleven-sided polygon

- barrel
- a bulging cylindrical shape; hollow with flat ends

- paraboloid
- a surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis

- stemma
- a tree diagram showing a reconstruction of the transmission of manuscripts of a literary work

- brachium
- (biology) a branching or armlike part of an animal

- diagonal
- (geometry) a straight line connecting any two vertices of a polygon that are not adjacent

- frown line
- a facial wrinkle associated with frowning

- pocket
- (bowling) the space between the headpin and the pins behind it on the right or left

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