Diameter
In geometry, diameter or centerline is a circle is a line segment that passes through the center point and connects two points on the circle, or, in modern use, the diameter means the length of the line segment. In a ball, the diameter connects 2 dots on the surface of the ball and through the center of the ball. Length of circle diameter is 2 times the radius. The diameter can be used to determine the perimeter and area of the circle. In a 3-dimensional ball, the diameter can be used to determine the surface area and volume of the ball. In addition, the diameter is the longest bow rope in the circle.