I assume you want the circumference which is pi times the diameter, so for 37 inch diameter the circumference would be about 116.24 inches.
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The circumference of a circle with a 20.5 inch diameter is 64.4 inches.
The area of a circle that has an 8.5 inch diameter is: 56.75 square inches.
If the diameter of a circle is 12 inches the circumference is: 37.7 inches (diameter x Pi = circumference).
The approximate area of a circle with a 12-inch diameter is: 113 square inches.
A 4-inch diameter circle has an area of 12.566 square inches.