| 1 mm² = 0.00000001 a | 
| 2 mm² = 0.00000002 a | 
| 3 mm² = 0.00000003 a | 
| 4 mm² = 0.00000004 a | 
| 5 mm² = 0.00000005 a | 
| 6 mm² = 0.00000006 a | 
| 7 mm² = 0.00000007 a | 
| 8 mm² = 0.00000008 a | 
| 9 mm² = 0.00000009 a | 
| 10 mm² = 0.0000001 a | 
| 15 mm² = 0.00000015 a | 
| 50 mm² = 0.0000005 a | 
| 100 mm² = 0.000001 a | 
| 500 mm² = 0.000005 a | 
| 1000 mm² = 0.00001 a | 
| 5000 mm² = 0.00005 a | 
| 10000 mm² = 0.0001 a |