72
The diameter is the full length from left to right and the radius is taken from a central point, in this cas at the 72 mark.
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144 ft.That would be twice the radius.
The diameter of a circle is twice its radius
The radius of a circle is half the diameter so if the radius of a circle is r, then the diameter is 2r.
The diameter of a circle is twice its radius
The radius of a circle is always half of the diameter. If the diameter is 85.4, the radius is 42.7.