Nouns denoting two and three dimensional shapes

convex polygon
a polygon such that no side extended cuts any other side or vertex; it can be cut by a straight line in at most two points
 
decahedron
any polyhedron having ten plane faces
 
ovoid
an egg-shaped object
 
tangent plane
the plane that contains all the lines tangent to a specific point on a surface
 
oval
a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it
 
complex plane
a geometric representation of the complex numbers established by the real axis and the orthogonal imaginary axis; it can be thought of as a modified Cartesian plane, with the real part of a complex number represented by a displacement along the x-axis, and the imaginary part by a displacement along the y-axis
 
angle of attack
the acute angle between the direction of the undisturbed relative wind and the chord of an airfoil
 
hexagram
a regular polygon formed by extending each of the sides of a regular hexagon to form two equilateral triangles
 
node
any thickened enlargement
 
wart
any small rounded protuberance (as on certain plants or animals)
 
incisura
(anatomy) a notch or small hollow
 
scalene triangle
a triangle with no two sides of equal length
 
tesseract
the four-dimensional analogue of a cube
 
double helix
a pair of parallel helices intertwined about a common axis
 
equilateral
a figure whose sides are all equal
 
vector
a straight line segment whose length is magnitude and whose orientation in space is direction
 
flare
a shape that spreads outward
 
complementary angles
two angles whose sum is a right angle
 
spiral
a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle
 
catenary
the curve theoretically assumed by a perfectly flexible and inextensible cord of uniform density and cross section hanging freely from two fixed points
 
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