The diameter of the circle is 9 centimeters. You can yourself construct this circle by taking 4.5 cms on your rounder and drawing a circle. The resultant circle will be a 90mm circle. Then you'll see how big it is.
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The circumference of a circle is the distance arround the edge of the circle. The area of a circle is how big the inside of the circle is.
well it depends how big the circle is
there is 360 degrees in a full circle no matter how big or small the circle it is
9mm
10mm=1cm therefore 90mm=9cm