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
5000.Area of a square = 0.5*(diameter)^2
The area would be 12*18, or 216 square millimeters.
If you have a rectangle, measure the length and width of your surface in millimeters and multiply the values. This gives you the area in square millimeters. If you know the area in square meters, multiply by one million (1 000 000) to get square millimeters.