Loading calculator...
What is the Triangle Calculator?
The Triangle Calculator calculates the area of a triangle using the lengths of its three sides (Heron's Formula).
How to Use This Calculator
1
Enter the lengths of all three sides (a, b, and c).
2
Click 'Calculate' to see the Area.
Example Calculation
Sides 3, 4, 5
Semi-perimeter (s) = (3+4+5)/2 = 6. Area = √(6 * (6-3) * (6-4) * (6-5)) = √(6*3*2*1) = √36 = 6.
Frequently Asked Questions
Pro Tips
- Check the triangle inequality theorem if you are unsure about the side lengths.
- This calculator works for scalene, isosceles, and equilateral triangles.