it is 0.000105km
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1 km = 105 cm so 1 sq km = (105)2 = 1010 or 10 billion sq cm.
2.5 * 105 cm in 2.5 km
2 km = 2*105 cm
105 km = 105,000 metres = 10,500,000 cm = 10,500,000/2.54 inches = 4,133,858 inches
1 km = 1000 metres and 1 metre = 100 cm so 1 km = 105 cm So 400 km = 4*107 cm.