About This Side Side Side Calculator
A side side side triangle calculator starts with three known lengths. It then solves the entire triangle from those sides. This method is useful when no angle is given. Surveying, drafting, navigation, roofing, and classroom problems often use it.
The tool first checks whether the three sides can form a triangle. Two shorter sides must be greater than the longest side. If that rule fails, the shape is not possible. This prevents false area and angle values.
After validation, the calculator finds the semiperimeter. It uses Heron's formula to calculate area. Then it applies the law of cosines for each angle. These angles show whether the triangle is acute, right, or obtuse. The result also labels the triangle as scalene, isosceles, or equilateral.
Advanced Measurements
Advanced measurements give more context. The perimeter shows total boundary length. The inradius describes the circle touching all three sides. The circumradius describes the circle through every vertex. Altitudes show perpendicular height from each side. Medians show lines from vertices to opposite side midpoints.
Use decimal precision to match your project. A higher precision is useful for engineering checks. A lower precision is easier for worksheets and reports. The unit label is optional. It can represent inches, feet, meters, or any consistent unit.
Export and Accuracy
The calculator also supports record keeping. You can download a CSV file for spreadsheets. You can create a PDF summary for sharing. Both options help keep calculations traceable.
For best results, measure each side carefully. Use the same unit for every input. Avoid mixing feet and inches without conversion. Small measurement errors can change angles. Very flat triangles are especially sensitive.
Complete outputs reduce repeated work. Instead of solving one value at a time, you receive a complete set. That makes comparison easier during design checks. It also helps students see how formulas connect. Area, angles, radii, heights, and medians all come from the same three sides. The example table shows typical inputs. Use it to test your own results before entering data.
This calculator is a general geometry tool. It does not replace licensed design review. For construction or structural work, verify local rules. Still, it gives a fast and transparent way to review SSS triangle geometry.