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Diameter of a circle = 2*radius Circumference of a circle = 2*radius*pi
To find the area of a circle for fifth grade, what one has to do is to first find the radius, the radius is the distance from the central point to all points on the circle, once the radius is found, square the radius. Then multiply the squared radius by pi.
The radius of a circle is the distance from its centre to its circumference. If a circle has a radius of r units then the length of its circumference is 2*pi*r units.
If you cut the ball in half, then find the middle, it would be the distance from the middle to the edge.
It is the distance from the center of the orbit to the center f the orbiting body.