9mm
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The area is 254.5 mm2
Diameter = 2 x radius = 18 mm .
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.
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