20cm *10cm = 0.2m *0.1m = 0.02 sq metres.
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100 cm is equivalent to 1 meter.
There are 100 cm in a meter. Thus 73 cm is less than a meter - it is .73 of a meter.
(39 cm) / (100 cm per meter) = 0.39 meter
1 meter=100 centimeters
well 100 cm equals 1m so it would be 200 cm