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A circle is a two-dimensional shape that is defined as the set of all points in a plane that are a fixed distance, called the radius, from a single point, called the center. The distance around the circle is called the circumference, and the distance from the center to any point on the circle is the radius. The diameter of a circle is the distance across the circle through the center. Circles have several unique properties, including the fact that they have an infinite number of lines of symmetry, and the ratio of the circumference to the diameter is a constant value known as pi (π). Circles are found in nature and are commonly used in mathematics, engineering, and architecture for their simplicity and symmetry.