A circle with a diameter of 4 mm has an area of : 12.57 mm2
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50.265 square mm
4mm is smaller than 5mm
A circle with a radius of 2.5 meters has an area of 19.63 square meters.
The circle's area is 314.159 cm2
The area of any circle is (pi) x (radius)2 .The area of half the circle is just half of that number.