# Nouns denoting two and three dimensional shapes

- critical angle
- the smallest angle of incidence for which light is totally reflected

- angular shape
- a shape having one or more sharp angles

- blob
- an indistinct shapeless form

- angle of view
- the angle included by a photographic lens

- spherical angle
- an angle formed at the intersection of the arcs of two great circles

- rhombus
- a parallelogram with four equal sides; an oblique-angled equilateral parallelogram

- heart
- a plane figure with rounded sides curving inward at the top and intersecting at the bottom; conventionally used on playing cards and valentines

- pit
- a concavity in a surface (especially an anatomical depression)

- dome
- a concave shape whose distinguishing characteristic is that the concavity faces downward

- perimeter
- a line enclosing a plane areas

- vortex
- the shape of something rotating rapidly

- conglobation
- a rounded spherical form

- center line
- a line that bisects a plane figure

- vector
- a straight line segment whose length is magnitude and whose orientation in space is direction

- dimple
- any slight depression in a surface

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

- element
- a straight line that generates a cylinder or cone

- oblique triangle
- a triangle that contains no right angle

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

- pucker
- an irregular fold in an otherwise even surface (as in cloth)

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