| 1 cm² = 0.000001 a | 
| 2 cm² = 0.000002 a | 
| 3 cm² = 0.000003 a | 
| 4 cm² = 0.000004 a | 
| 5 cm² = 0.000005 a | 
| 6 cm² = 0.000006 a | 
| 7 cm² = 0.000007 a | 
| 8 cm² = 0.000008 a | 
| 9 cm² = 0.000009 a | 
| 10 cm² = 0.00001 a | 
| 15 cm² = 0.000015 a | 
| 50 cm² = 0.00005 a | 
| 100 cm² = 0.0001 a | 
| 500 cm² = 0.0005 a | 
| 1000 cm² = 0.001 a | 
| 5000 cm² = 0.005 a | 
| 10000 cm² = 0.01 a |