The circumference of a 4 inch round circle is: about 12.57 inches. You can easily do this calculation for other circles by multiplying the diameter by Pi (about 3.1416).
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12.5663706144, because the diameter (4) times Pi equals circumference
The square because its perimeter is 16 inches while the circumference of the circle is 15.708 inches.
The circumference of a 4 foot circle is: 12.57 feet(diameter x pi = circumference).
If the circumference of the circle is 4 inches then the radius = 4/(2*pi) = 0.6366197724 inches And the area of the circle = pi*0.63661977242 = 1.273239545 or about 1.273 square inches
Given a circle with a diameter of 4, the circumference is: 12.6 (diameter x Pi = circumference).