Triangle Calculator
Solve a triangle from three sides or two sides and an angle.
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About the Triangle Calculator
Enter three sides, or two sides and the angle between them, to find the missing sides and angles, plus area and perimeter. It uses the laws of sines and cosines and Heron's formula.
Formulas
- Heron: area = √(s(s−a)(s−b)(s−c)), s = half perimeter
- Cosine rule: c² = a² + b² − 2ab cos C
Handy for geometry homework, carpentry and land measurement.
مثلث کیلکولیٹر
تین اطراف یا دو اطراف اور زاویہ درج کریں اور باقی اطراف، زاویے، رقبہ اور محیط معلوم کریں۔
- ہیرون اور کوسائن فارمولا
- زمین کی پیمائش اور ہوم ورک کے لیے
How to use Triangle Calculator
- Enter your values. Units and defaults are shown beside each field.
- Press Calculate (results also update as you type once calculated).
- Read the result and the step-by-step breakdown with the formula used.
- Copy the result or reset to start again.
Frequently asked questions
How accurate is this calculator?
Calculations use the standard formulas shown on the page, computed in full precision and rounded only for display. The result is only as accurate as the inputs and assumptions listed.
Is it free?
Yes. All tools are free to use without an account.