There are 1000000000 nanometres in one metre. There are 10 metres in one decametre. Therefore, one decametre is equal to 1000000000 x 10 = 10000000000 nanometres.
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There are approximately 393.7 inches in a decameter.
The unit between a decimetre and a decametre is a metre. Decimetre is 1/10th of a metre, decametre is 10 metres, and a metre is the base unit of length in the metric system.
There are 10 metres in one decametre. Therefore, 200 metres is equal to 200/10 = 20 decametres.
There are one billion nanometers in a kilometer. A nanometer is one billionth of a meter, and a kilometer is one thousand meters. So, 1 km = 1,000 m = 1,000,000,000 nm.
There are 10 metres in one decametre. Therefore, 8 decametres is equal to 8 x 10 = 80 metres.