The radius of any circle is half the diameter.
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The radius is 72 inches.
72, double the radius because radius is half of the whole diameter.
What aspect of the circle is 72? You will get a different answer depending on whether 72 refers to the diameter, circumference or area.
What aspect of the circle is 72? You will get a different answer depending on whether 72 refers to the radius or circumference.
If you mean a circle then:- radius = sq rt of (72/pi) = 4.787 inches to 3 decimal places