if it's a circle it's: 706.9=pi(r2) which makes the diameter about 30.0009 cm
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A circle with a diameter of 25 mm has an area of 490.9 square mm.
It works out as slightly over 30 mm
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.
5000.Area of a square = 0.5*(diameter)^2
The area would be 12*18, or 216 square millimeters.