Nouns denoting two and three dimensional shapes

outer boundary
the outside boundary or surface of something
 
perpendicular
a straight line at right angles to another line
 
spiral
a plane curve traced by a point circling about the center but at increasing distances from the center
 
intrados
the interior curve of an arch
 
sinusoid
the curve of y=sin x
 
loop
anything with a round or oval shape (formed by a curve that is closed and does not intersect itself)
 
figure eight
a two-dimensionsal figure having the shape of the number eight
 
complementary angles
two angles whose sum is a right angle
 
spherical triangle
a spherical polygon formed by the arcs of 3 great circles
 
corner
a small concavity
 
prismoid
a prismatoid whose bases are polygons having the same number of sides and whose other faces are trapezoids or parallelograms
 
oblique triangle
a triangle that contains no right angle
 
impression
a concavity in a surface produced by pressing
 
symmetry
balance among the parts of something
 
column
anything that approximates the shape of a column or tower
 
tree
a figure that branches from a single root
 
projection
any solid convex shape that juts out from something
 
equilateral triangle
a three-sided regular polygon
 
lower bound
(mathematics) a number equal to or less than any other number in a given set
 
corrugation
a ridge on a corrugated surface
 
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