Online Triangle Calculator for Sides, Angles, and Area
This Triangle Calculator determines a triangle’s properties from three known side lengths. You can enter the lengths for side A, side B, and side C to find the internal angles, area, perimeter, and type of triangle. The tool uses the law of cosines and Heron’s formula to provide accurate geometric solutions without manual calculations.
- Side-Side-Side (SSS) Input: Solves any triangle when the lengths of all three sides are known.
- Angle Calculation: Automatically computes the three internal angles of the triangle in degrees.
- Area and Perimeter: Instantly calculates the area and the perimeter of the triangle.
- Triangle Identification: Determines if the triangle is equilateral, isosceles, scalene, or a right triangle based on your inputs.
How to Use the Triangle Calculator
- Enter the length of Side A into the first input box.
- Provide the length of Side B in the second input box.
- Type the length of Side C into the final input box.
- Click the Calculate button to get the triangle’s complete properties.