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The set of all points a given distance from a center point is a circle. The given distance is the radius, and the given point is the center. Or, in 3 dimensional space, a sphere.
A circle is the set of all points in a plane at a given distance FROM a given point, which is known as the circle's center.
That means that a given circle doesn't have two or three diameters. For a given circle, there is a unique measurement, called its "diameter". It is the distance from one end to the other, passing through the center. Since the circle is defined as all the points that are at the same distance from a point (the center), all radii are the same distance; and the diameter is simply twice the radius.
Distance = time * average speed (velocity) Average speed = Distance/time
The shortest distance from the given information will be its height