# 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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