Your one-stop tool for solving triangle geometry. Created by Mr. Dhananjoy Ghosh.
Enter the lengths of the three sides below to find the triangle's area, perimeter, angles, and classification.
This tool provides a complete analysis of a triangle from the lengths of its three sides. Here's a breakdown of the calculations performed:
This calculator uses Heron's formula. First, it finds the semi-perimeter ($s$), which is half the total perimeter: $s = (a+b+c) / 2$. Then, it applies the formula: $Area = \sqrt{s(s-a)(s-b)(s-c)}$.
Yes. Based on the side lengths, it determines if the triangle is Equilateral (all sides equal), Isosceles (two sides equal), or Scalene (no sides equal). It also identifies if it's an Acute, Right, or Obtuse triangle by analyzing its angles.
The Law of Cosines is used to find the angles of the triangle. For any triangle with sides $a$, $b$, and $c$, and the angle $C$ opposite side $c$, the law states: $c^2 = a^2 + b^2 - 2ab \cos(C)$. Our calculator rearranges this formula to solve for each angle.
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