Triangle Area Calculator with Heron's Formula
Calculate the area of a triangle from its three sides.
u
u
u
Result
24 br²
Triangle area: 24 u²
Result in all units
Step-by-step solution
Area = √(s(s−a)(s−b)(s−c))
What Is Heron's Formula?
Heron's formula lets you calculate the area of a triangle when only its three sides are known. It is used for triangles whose height is unknown.
How is it calculated?
How Is It Calculated?
s = (a+b+c) ÷ 2, Area = √(s(s−a)(s−b)(s−c))
- Enter the three sides.
- The semi-perimeter s is found, then the formula is applied.
Frequently Asked Questions
Do any three side values form a triangle?
No; each side must be smaller than the sum of the other two (triangle inequality).