Nouns denoting two and three dimensional shapes

prick
a depression scratched or carved into a surface
 
acute angle
an angle less than 90 degrees but more than 0 degrees
 
Platonic solid
any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
 
sector
a plane figure bounded by two radii and the included arc of a circle
 
internal angle
the angle inside two adjacent sides of a polygon
 
acantha
any sharply pointed projection
 
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
 
diagonal
(geometry) a straight line connecting any two vertices of a polygon that are not adjacent
 
equator
a circle dividing a sphere or other surface into two usually equal and symmetrical parts
 
angle of attack
the acute angle between the direction of the undisturbed relative wind and the chord of an airfoil
 
regular polygon
a polygon with all sides and all angles equal
 
quadrangle
a four-sided polygon
 
shapelessness
an amorphous or indefinite shape
 
trigon
a three-sided polygon
 
equilateral
a figure whose sides are all equal
 
extrusion
something that bulges out or is protuberant or projects from its surroundings
 
right-angled triangle
a triangle with one right angle
 
pentacle
a star with 5 points; formed by 5 straight lines between the vertices of a pentagon and enclosing another pentagon
 
magnetic dip
(physics) the angle that a magnetic needle makes with the plane of the horizon
 
leaf shape
any of the various shape that leaves of plants can assume
 
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