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Radius is half the diameter. 36/2=18
It's 18 cm. The radius is half the diameter of a circle. Half 36 cm is 18 cm.
radius = 18/2 = 9 cm
If the radius is 18 feet - then the diameter is 36 feet. The circumference measurement is irrelevant !
It is 18 centimeters because your radius is exactly half of the diameter in any circle