About Triangle Calculator & Trigonometric Solver
Solve any triangle given its 3 side lengths using Heron's formula and the Law of Cosines. Calculates surface area, perimeter, all 3 interior angles in degrees, and classifies the triangle by sides and angles.
Key Capabilities & Features
- Calculates area using Heron formula s = (a+b+c)/2
- Calculates all 3 interior angles via Law of Cosines
- Validates triangle inequality theorem
- Classifies Equilateral, Isosceles, Scalene, Right, Acute, and Obtuse
How to Use Triangle Calculator & Trigonometric Solver
1
Enter Sides
Input side lengths a, b, and c.
2
Review Area
Inspect calculated triangle area and perimeter.
3
Check Angles
Review interior angles α, β, and γ.
Privacy & In-Browser Execution Guarantee
Geometry calculations run locally on your device.
Frequently Asked Questions
What is Heron’s formula?
Heron’s formula calculates the area of any triangle from its three side lengths: Area = √[s(s - a)(s - b)(s - c)], where s is the semi-perimeter (a + b + c) / 2.
Related Tools in this Suite
Pythagorean Theorem Calculator (a² + b² = c²)
Calculate hypotenuse or missing legs with exact simplified radicals and step-by-step algebra
Circle Geometry Calculator (Radius, Area, Circumference)
Calculate circle radius, diameter, circumference, surface area, arc length, and sector area
2D Geometry Area Calculator (Multi-Shape)
Calculate 2D surface area for rectangles, triangles, circles, trapezoids, and ellipses