The length of the space between two sides of a circle passing through the radius,
Alternatively it is twice the length of the radius. This is the distance from the centre of the circle to any point on the circumference
几何学中圆的直径
The length of the space between two sides of a circle passing through the radius,
Alternatively it is twice the length of the radius. This is the distance from the centre of the circle to any point on the circumference
几何学中圆的直径