Frequently Asked Questions
What does Heron's formula need?
It needs only the three side lengths of a triangle, with no angle or height, to find the area.
Why might it report no triangle?
If any side is longer than the sum of the other two, the sides cannot close into a triangle, so the calculator reports an error.
What is the semiperimeter in Heron's formula?
The semiperimeter s is half the perimeter, s = (a + b + c) / 2. Heron's formula then gives the area as the square root of s(s - a)(s - b)(s - c). For sides 3, 4, and 5 the semiperimeter is 6 and the area works out to 6.
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Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.