Circles

A circle is a perfectly round, closed shape where every point on its edge is equidistant from its center. This distance is called the radius. The entire boundary, known as the circumference, is smooth and continuous. Circles are fundamental in geometry and appear in natural and man-made objects, like wheels and coins. They have unique properties, such as the constant ratio of circumference to diameter, known as pi. Circles are used in designing, engineering, and illustration, serving both aesthetic and functional purposes due to their symmetry and uniform shape.