The circumference of a circle = 2*pi*radius or diameter*pi
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The circumference of a circle with a diameter of 6cm is about 18.85cm
Circumference = 2 pi R = 12 pi = 37.7 cm(rounded)
Circumference of a circle is 2πr (two x Pi x the radius of the circle)Pi is usually taken as 3.14 for simple calculations - see here http://en.wikipedia.org/wiki/Pi for a longer determination of Pi.The radius is half the diameter.Thus, a circle with a diameter of 6cm has a circumference of 18.84cm
Perimeter = 6cm + 6cm + 9cm + 9cm = 30cm
The answer depends on what the "6cm" refers to.