Nouns denoting two and three dimensional shapes

regular hexahedron
a hexahedron with six equal squares as faces
 
two-dimensional figure
a two-dimensional shape
 
lead
the angle between the direction a gun is aimed and the position of a moving target (correcting for the flight time of the missile)
 
equiangular triangle
a three-sided regular polygon
 
pentagon
a five-sided polygon
 
pentacle
a star with 5 points; formed by 5 straight lines between the vertices of a pentagon and enclosing another pentagon
 
flank
a subfigure consisting of a side of something
 
twist
a circular segment of a curve
 
frown line
a facial wrinkle associated with frowning
 
crack
a long narrow depression in a surface
 
figure
a combination of points and lines and planes that form a visible palpable shape
 
circle
something approximating the shape of a circle
 
hexagon
a six-sided polygon
 
convex polyhedron
a polyhedron any plane section of which is a convex polygon
 
caput
a headlike protuberance on an organ or structure
 
love line
a crease on the palm; palmists say it indicates your emotional nature
 
bottleneck
a narrowing that reduces the flow through a channel
 
tesseract
the four-dimensional analogue of a cube
 
chord
a straight line connecting two points on a curve
 
helix angle
the constant angle at which a helix cuts the elements of a cylinder or cone
 
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