# Nouns denoting two and three dimensional shapes

- equilateral
- a figure whose sides are all equal

- hypotenuse
- the side of a right triangle opposite the right angle

- cylinder
- a solid bounded by a cylindrical surface and two parallel planes (the bases)

- geodesic
- (mathematics) the shortest line between two points on a mathematically defined surface (as a straight line on a plane or an arc of a great circle on a sphere)

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

- perversion
- a curve that reverses the direction of something

- cardioid
- an epicycloid in which the rolling circle equals the fixed circle

- angularity
- a shape having one or more sharp angles

- recess
- a small concavity

- isosceles triangle
- a triangle with two equal sides

- block
- a three-dimensional shape with six square or rectangular sides

- sphere
- a three-dimensional closed surface such that every point on the surface is equidistant from the center

- angular distance
- the angular separation between two objects as perceived by an observer

- exterior angle
- the supplement of an interior angle of a polygon

- wedge
- any shape that is triangular in cross section

- spherule
- a small sphere

- incisure
- (anatomy) a notch or small hollow

- frustum
- a truncated cone or pyramid; the part that is left when a cone or pyramid is cut by a plane parallel to the base and the apical part is removed

- ridge
- any long raised strip

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

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