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Area is calculated using Heron's formula: A = √(s(s−a)(s−b)(s−c)), where s is the semi-perimeter. The calculator also identifies the triangle type (equilateral, isosceles, or scalene) and whether it's a right triangle.
Triangles are foundational shapes in geometry and engineering. Solving for triangle sides, interior angles, area, and perimeter is made easy by applying the Pythagorean Theorem, the Law of Sines, and the Law of Cosines.
If you know the three sides of a triangle but no angles, you can easily use the Law of Cosines to solve for all three interior angles.