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The closed cyclic self-intersecting hexagon formed by joining the adjacent antiparallels in the construction of the cosine circle. The sides of this hexagon have the property ...

Of all convex n-gons of a given perimeter, the one which maximizes area is the regular n-gon.

The area of the dodecagon (n=12) inscribed in a unit circle with R=1 is A=1/2nR^2sin((2pi)/n)=3.

The star figure {9/3} composed of three equilateral triangles rotated at angles 0 degrees, 40 degrees, and 80 degrees. It has been called the star of Goliath by analogy with ...

One of the three 2-polyaboloes.

A 6-polyabolo.

A 5-polyabolo.

One of the four 5-polyiamonds are called pentiamonds.

A heptomino in the shape of the Greek character pi.

A line segment on the boundary of a face, also called a side.