Area = pi*82 = 201.062 square units to 3 d.p.
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The circumference of a circle with a diameter of 16 centimeters is 50.27 cm
The circumference of a circle that is 16 mm in diameter is 50.27 mm
The area of a circle with a diameter of 16 inches is: 201.1 square inches.
The diameter is about 5.1'
diameter = circumference/pi.