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arc length
"Diameter" is the distance all the way across the circle, through the center."Radius" is 1/2 of the diameter ... the distance from the center to the curvy part of the circle."Circumference" is the distance all the way aroundthe circle.
The radius of a circle is the distance from the center of the circle, out to the edge of the circle. The distance all the way across the circle is the "diameter." Half of the diameter is the radius.
Infinity Incorrect ! The longest distance between those two points is a straight line from one point , running all the way around the world to the second point. Thus the shortest distance together with the longest distance is a full circle around the world with both points on the circle.
The outside of the circle is always the same distance from the centre. The outside of an ellipse is not the same distance from the centre all the way round.