12.56
To the same accuracy as the one significant figure in the question: 10 inches
The circumference of a circle when the radius is 3 inches is: 18.8 inches (r x 2 x Pi = circumference)
Circumference = 2*pi*radius or circumference/2*pi = radius 90 inches/2*pi = 14 inches in radius =======================
A circle with a radius of 3 inches has a circumference of 18.8 inches
A circle with a radius of 1.5 inches (d/2) has a circumference of 9.4 inches.
A circle with a radius of 16 inches (32/2) has a circumference of 100.53 inches.
The circumference of a circle with a 13-inch radius is: 81.68 inches (r x 2 x pi = circumference).
The circumference of a circle can be calculated using the formula C = 2πr, where r is the radius of the circle. In this case, if the radius is 4 inches, then the circumference would be C = 2 x π x 4 = 8π inches, or approximately 25.13 inches.
Circumference of the circle if the radius is 12 inches is 2*pi*r = 24*pi = 75.398
The circumference of a circle with the radius of 28 inches is 175.9 inches. (C = r x 2 x Pi).
The circumference of a circle with a radius of 8.5 inches is 53.41 inches. (C = r x 2 x Pi)
A circle with a radius (d/2) of 39.25 inches has a circumference of 246.6 inches.
Circumference = 2*pi*6 inches