Area of a circle = pi*r2 , where pi = 3.14 and r is the radius of the circle.
We have diameter(d) = 12mm so, radius(r) = d/2 = 6mm
On putting the values we get
Area = 3.14*62 = 3.14*36 = 113mm2
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A 12 mm circle has a diameter of 12 millimeters, which is slightly less than half an inch (approximately 0.47 inches). The radius, which is half the diameter, is 6 mm. In terms of area, the circle has an area of about 113.1 square millimeters. This size is comparable to the diameter of a large button or a small coin.
The radius of a circle is always half of the distance of the diameter. If you have a 24 mm diameter - then the radius would be 12 mm.
A circle with a diameter of 25 mm has an area of 490.9 square mm.
Area = pi*552 square mm
Area = pi*282 square mm