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topic: 13th step a perfect circle
description for 13th step a perfect circle
A circle is a simple shape of Euclidean geometry consisting of those points in a plane which are the same distance from a given point called the ''centre''. The common distance of the points of a circle from its center is called its ''radius.'' Circles are simple closed curves which divide the plane into two regions, an interior and an exterior. In everyday use, the term "circle" may be used interchangeably to refer to either the boundary of the figure (known as the ''perimeter'') or to the whole figure including its interior. However, in strict technical usage, "circle" refers to the perimeter while the interior of the circle is called a ''disk''. The ''circumference'' of a circle is the perimeter of the circle (especially when referring to its length). A circle is a special ellipse in which the two foci are coincident. Circles are conic sections attained when a right circular cone is intersected with a plane perpendicular to the axis of the cone.
definition for 13th step a perfect circle
coming next after the twelfth in position
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