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circle
Circles are simple shapes of Eucliean geometry. A circle consists of those points in a plane which are at a constant distance, called the radius, from a fixed point, called the center. A circle with center A is sometimes denoted by the symbol A.
Trivia about circle
It's an ellipse with an eccentricity of zero
To figure the ratio of its circumference to its diameter is as easy as pi
Its area equals pi r (squared)
Ladies who gather over needle & thread make up a sewing one of these shapes
The "henge" part of the word Stonehenge is a term meaning an ancient monument arranged in this shape
The ordinary conic sections are the hyperbola, the parabola, the ellipse & this
Ferdinand von Lindemann proved the problem of "squaring" this with compass & ruler was impossible
In plane geometry, a chord is a line segment connecting 2 points that lie on this shape
The saw, an ancient tool, was first patented in this shape by Samuel Miller in 1777
In the Old West, you did this to "the wagons" when there was an attack