This triangle area reference table shows the area (heron's formula) for a range of side a values, assuming a side b of 4 units and a side c of 5 units. Every figure is computed with the same engine that powers our Triangle Area Calculator, so the numbers are exact.
| Side a | Area (Heron's formula) | Perimeter | Semi-perimeter |
|---|---|---|---|
| 1.5 units | 2.4804 | 10.50 | 5.25 |
| 2.3 units | 4.5055 | 11.30 | 5.65 |
| 3 units | 6.0000 | 12.00 | 6.00 |
| 4.5 units | 8.5493 | 13.50 | 6.75 |
| 6 units | 9.9216 | 15.00 | 7.50 |
| 9 units | 0.0000 | 18.00 | 9.00 |
How to use this table
Find the row closest to your side a and read across to the area (heron's formula). For a value between two rows, the real figure sits between them — or enter your exact numbers in the Triangle Area Calculator for a precise answer.
Need a value that is not in the table? — the Triangle Area Calculator does it instantly, for free, with the formula and a worked example built in.
Related calculators
Continue exploring math calculators with these tools: Margin of Error Calculator, Sample Size Calculator, Confidence Interval Calculator, Coefficient of Variation Calculator, Regular Heptagon Area Calculator.