A paragraph could very well be one sentence, but it could just as easily be a long 20 sentence paragraph. It's usually thought of as being a complete separate thought and containing as many sentences are needed before you reach a natural breaking point to move on to the next paragraph. Hope that helped.
Centi-means one-hundredth, so 1metre = 100 centimeters, therefore 1 decameter = 10 x (100 centimeters) = 1000 centimeters. Hecto-means one hundred, therefore 1 hectometer = 100 meters = 10 decameters. Kilo-means one thousand, of course, so 1 kilometer = 1000 meters, and since 1 hectometer = 100 meters, 1 kilometer = 10 hectometers.
How many meters are in 1 kilometer? Officially, the definition of a meter is the length of the path travelled by light in a vacuum during a time interval of 1/299,792,458 of a second. Therefore, the official definition of a kilometer is ten times that distance, which happens to be 1,000 meters. For a real world comparison, imagine Central Park in New York City. It is 849 meters wide â just short of a kilometer â and approximately 4 kilometers long.