| Triangle | a | b | c | s | s - a | s - b | s - c | Area | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 5 | 5 | 5 | 7.5 | 2.5 | 2.5 | 2.5 | 10.825 | |
| 2 | 12 | 13 | 15 | 20 | 8 | 7 | 5 | 74.833 | |
| 3 | 3 | 3 | 3 | 4.5 | 1.5 | 1.5 | 1.5 | 3.897 |
| Triangle | a | b | c | s | s - a | s - b | s - c | Area | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 5 | 5 | 5 | 7.5 | 2.5 | 2.5 | 2.5 | 10.825 | |
| 2 | 12 | 13 | 15 | 20 | 8 | 7 | 5 | 74.833 | |
| 3 | 3 | 3 | 3 | 4.5 | 1.5 | 1.5 | 1.5 | 3.897 |