6 centimetres is a length: it does not have a diameter.
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pi*r2 = 28.26 Divide both sides by pi: r2 = 8.995437384 Square root both sides: radius = 2.999239468 diameter = 2*radius: diameter = 5.998478935 or 6 centimeters to the nearest cm.
The area of a circle with a diameter of 6.4 centimeters is: 32.17 cm2
201.06 square centimeters.
If the circumference of a circle is 45 cm the length of the diameter in centimeters is: about 14.32 cm
The circle's diameter is 5.998 cm