20km2 = 200 000 000 000cm2
200 000 000 000 / 500 = 400 000 000
√400 000 000 = 20 000
1: 20 000
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20km2 = 200 000 000 000cm2
200 000 000 000 / 500 = 400 000 000
√400 000 000 = 20 000
1: 20 000