If a circle has a diameter of 24 inches its circumference is: 75.4 inches (diameter x Pi = circumference).
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The circumference of a circle is calculated using the formula C = πd, where C is the circumference, π is a mathematical constant approximately equal to 3.14159, and d is the diameter of the circle. In this case, the diameter of the circle is 24 inches. Therefore, the circumference of a 24-inch round circle would be C = π * 24 = 75.398 inches.
about 7.64 feet
The circumference of a 24 foot diameter circle is about 758.4 feet. (C = d x Pi)
The diameter of a circle is found by dividing the circumference by Pi (about 3.1416). So, for your example: 24m / 3.1416 = about 7.64 meters diameter.
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.