Diameter = 12 inches, Circumference = 12*(pi) = approx. 37.699
Radius = 12 inches, Circumference = 2*12*(pi) = 24*(pi) = approx. 75.398 inches
If the author has actually measured the outside of the circle (i.e. the perimeter of a dinner plate), that is the circumference! Problem solved.
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Circumference of a circle = 2*pi*radius or diameter*pi
The circumference of a 12 cm circle is: 37.7 cm
The radius of a circle with a circumference of 12 is: 1.91
The area of a circle with a 12-foot circumference is about 11.46 square feet.
Its radius will be 76/2*pi which is about 12 inches rounded to the nearest integer