Area = pi*262 = 676*pi square mm
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A circle with a diameter of 4 mm has an area of : 12.57 mm2
If the diameter of a circle is 3mm the circumference is: 9.424 mm
Well, honey, the radius of a circle is always half of the diameter. So if the diameter is 30 mm, the radius would be 15 mm. It's basic math, darling. Hope that clears things up for you!
12mm - half the diameter.
15mm. diameter is twice the radius