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If 27 inches is the diameter, then that is the diameter. If 27 inches refers to the radius, you must multiply it by 2 to get the diameter.
27 inches
27 circumfrencee
The circumference of a circle with a diameter of 45 inches is 141.37 inches.
If the area of a circle is about 28 square inches the diameter of the circle is: about 6 inches (5.971).