1 kilometre is equal to 1000 metres. One metre is equal to 1000 millimetres. Therefore, one kilometre is equal to 1000 x 1000 = 1,000,000 millimetres.
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By unit of length and distance and conversion ,we can say that 1 km=1000000 mm 20000 mm=0.02 km
1 kilometer=1,000,000 millimeters
1 mm = 1000 um
1 micrometer equals to 0.0001 mm
1 kilometer=100,000 centimeters