Area measure
A unit of area , also area unit or more precisely unit of area , is understood to be a unit of measurement for specifying the area of an area . A surface measure is used to measure or specify the content of an area in two dimensions , such as the surface of a body .
The determination of the content of an area ( planimetry ) can be done by determining how often a unit of area is contained in this area. A rectangle with side lengths a = 5 m and b = 3 m therefore has an area of A = 15 m 2 . In the designation m 2 , the superscript number 2 means that there are two dimensions: length and width.
square meters
According to the international system , the area dimensions are derived from the meter and its parts as well as multiples in accordance with the meter convention . The basic unit is the square meter : 1 m 2 is the area of a square with a side length of 1 m.
comparison
Depending on the application, larger or smaller surface units are used. The following table provides an overview:
| Surname | conversion | surface | Abbr. |
|---|---|---|---|
| Square kilometre | 1000 m x 1000 m | 1,000,000 m 2 | km 2 |
| Hectares | 100 m x 100 m | 10,000 m 2 | Ha |
| Ar | 10 m 10 m | 100 m 2 | a |
| square meters | 1 m x 1 m | 1 m 2 | m 2 |
| Square decimeters | 0.1m x 0.1m | 0.01 m 2 | dm 2 |
| Square centimeters | 0.01m x 0.01m | 0.0001 m 2 | cm 2 |
| Square millimeters | 0.001 m by 0.001 m | 0.000001 m 2 | mm 2 |
Other square measures still used today are: barn , square inches , square feet , square mile , acre , dunam , acre , rai , pyeong . Information on the area dimensions that were used in the past can be found in the article " Old dimensions and weights ". The article “ Size (area) ” provides an overview of objects of various dimensions .
