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The prefix "deca-" means ten. It has ten faces.
Deca is a prefix meaning 10. Hence, a decameter is 10 meters, and therefore it is larger than a meter.
a deca is bigger than a deci deca=10 deci=0.1
There are 10 decameters in 1 hectometer. This is because the prefix "hecto-" represents 100 units, while the prefix "deca-" represents 10 units. Therefore, when converting from hectometers to decameters, you multiply by 10.
The name of a 18 sided figure is an octadecagon or octakaidecagon. As you can see the prefix octa- means 8, and deca- means 10. It has 18 sides and 18 vertices,