The diameter of a circle is the distance from one side of the circle to the other side by a straight line going through the center point of the circle. The longest distance between any two points on a circle.
One-half of the diameter is the radius. That is the distance from the center of the circle to any point on the circle by a straight line.
The square of the radius (the radius times the radius) times the value of pi is equal to the distance around the circle called the circumference.
Chat with our AI personalities