The diameter of a free throw circle is 9 feet and 6 inches. That line from the center of the free throw line to the top of the key is the radius of the circle.
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The radius is half of the diameter of a circle.
Diameter of a circle = circumference/pi
The radius of a circle is half of its diameter
The radius of the circle is half the diameter of the circle. 30mm radius would mean 60mm diameter or 6cm.
The distance around a circle is the circumference. The diameter of a circle is the distance across the center of a circle.