# 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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