(d) diameter = 2*radius (r)
circumference = 2 * pi * r = 2r * pi = d * pi
1.1 * 3.14159 = 3.455749
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Circumference: 11*pi
The circumference of a circle that has a diameter of 23' 11" is 901.64 inches.
The circumference of a circle with a 3.5 diameter is 11.
since the circumference of a circle is pi*diameter, the diameter would be equal to 11pi. You CAN multiply 11 by pi, but it isn't really helpful in any way IN THIS CASE
the exact circumference is 11pi inches