Triangle area = ½ × base × height, or using Heron's formula for 3 sides: Area = √(s(s-a)(s-b)(s-c)) where s = (a+b+c)/2. For right triangles: a² + b² = c².
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📐 Triangle Calculator
Calculate triangle area, perimeter, and angles from sides or base/height. Includes Pythagorean theorem solver for right triangles.
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Uses standard geometric formulas. Free for students and engineers. No sign-up needed.
🤔 How Does This Work?
Base/Height: Area = ½bh
Heron's: Area = √(s(s-a)(s-b)(s-c))
Right triangle: c = √(a²+b²)
❓ Frequently Asked Questions
What is Heron's formula?▼
Heron's formula calculates triangle area from all 3 side lengths without needing height: Area = √(s(s-a)(s-b)(s-c)), where s is the semi-perimeter.
What is the Pythagorean theorem used for?▼
a² + b² = c² relates the sides of a right triangle, where c is the hypotenuse. Given any 2 sides, find the third.