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.
In 1795, when the metric system was introduced, the are was defined as 100 square metres and the hectare ( hecto-  + are) was thus 100 ares or 1â100 km 2. When the metric system was further rationalised in 1960, resulting in the International System of Units (SI), the are was not included as a recognised unit.n 1795, when the metric system was introduced, the are was defined as 100 square metres and the hectare ( hecto-  + are) was thus 100 ares or 1â100 km 2. When the metric system was further rationalised in 1960, resulting in the International System of Units (SI), the are was not included as a recognised unit.