Enter the three side lengths of a triangle to calculate all angles, area, perimeter, and classify the triangle type.
This tool solves a triangle when all three side lengths (SSS) are known, finding the interior angles, area, and perimeter.
Area is calculated using Heron's Formula: Area equals the square root of s(s-a)(s-b)(s-c), where s is the semi-perimeter. Angles are found using the Law of Cosines.
Enter the lengths of all three sides. Click Calculate. The tool checks if the sides form a valid triangle and shows all angles, area, and perimeter.
Example: For sides 5, 6, and 7, the triangle is scalene and acute, with an area of approximately 14.7 square units.
What makes a valid triangle. The sum of any two sides must be greater than the third side, known as the triangle inequality.
What is Heron's Formula used for. It calculates the area of a triangle using only its three side lengths, without needing height.