70,000mm
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1 cm = 10 mm so 1 cm2 = 10*10 mm2 So 80.2 cm2 = 80.2 * 100 mm2 = 8020 mm2
If the circle has a RADIUS of 1mm then about 3,14 mm2 If the circle has a DIAMETER of 1mm then about 0,785 mm2
100mm2
828826031.43
1 mm is 1/10 of a cm, so 1 mm2 is 1/100 of a cm2.