radius = square root of (75/pi) = 4.886025119
diameter = 2*radius = 9.772050238 or 10 mm to the nearest integer
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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
If the diameter of a circle is 5.4mm, then the radius is 2.7 mm. The formula for the area of a circle is PIr^2. So, the area is then 22.9 mm2.
14400 x pi sq mm