ヘロンの公式計算機

共有リンク

はじめに

Heron's Formula Calculator — Find a triangle's area from its three side lengths. Enter Side a, Side b, Side c to get an instant, accurate result.

計算式

Area = √(s(s−a)(s−b)(s−c)), where s = (a+b+c)/2 is the semi-perimeter and a, b, c are the three side lengths.

ステップごとの説明

Enter the Side a.
Enter the Side b.
Enter the Side c.
Click Calculate to see your result instantly.

実例

Example: With Side a = 3, Side b = 4, Side c = 5, the Heron's Formula Calculator gives Area: 6, Semi Perimeter: 6.

よくある質問

What's special about Heron's formula?

It finds a triangle's area from its three sides alone, without needing to know any angle or height.

What if the sides are invalid for a triangle?

If the radicand is not positive, the three lengths cannot form a real triangle and no area is returned.

What inputs does the Heron's Formula Calculator need?

You'll need to provide: Side a, Side b, Side c. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.

How accurate is the Heron's Formula Calculator?

The Heron's Formula Calculator applies the formula exactly as calculated — Area = √(s(s−a)(s−b)(s−c)), where s = (a+b+c)/2 is the semi-perimeter and a, b, c are the three side lengths. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.

Is the Heron's Formula Calculator free to use?

Yes, the Heron's Formula Calculator is completely free, requires no signup, and runs instantly in your browser.