All depends what you mean by 18 inches, is that the circumference, the diameter or the radius
you have to quote the diameter or radius or circumference of the circle to calculate the area. If diameter 78.53. If radius 314.15. If circumference 7.95
The area of a circle with an 8 inch diameter is approximately 50.27 square inches.
A circle with an 8-inch diameter has a perimeter of 25.1 inches.
19.63 square inches are in the area of a 5-inch diameter circle.
The circumference of an 8 inch circle is: 25.13 inches(diameter x Pi = circumference).
circumference = 17pi inches
(6 pi) inches.
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.
All depends what you mean by 18 inches, is that the circumference, the diameter or the radius
you have to quote the diameter or radius or circumference of the circle to calculate the area. If diameter 78.53. If radius 314.15. If circumference 7.95
The perimeter or circumference of a circle is pi x diameter where pi = 3.1416 The circumference of a 12 inch circle is 3.1416 x 12 = 37.699 inches so two 36 inch lengths will be required.
The circumference of a circle, with a diameter of 12 inches, is 37.7 inches.
C = 131.95 inches.
The circumference is about 131.9 inches. (C = r x 2 x Pi)
A 1.25-inch diameter circle contains 1.227 square inches.
A 4.75-inch diameter circle contains 17.72 square inches.