---
id: trianglesolver
version: "1.2"
license: MIT
license_treatment: permissive
maintenance: abandoned
---

# trianglesolver — Find all the sides and angles of a triangle, if you know some of the sides and/or angles. (Uses the Law of Sines and Law of Cosines.)

License: permissive · Maintenance: abandoned · Downloads: 414.5K/mo

## What it is and what it does

Trianglesolver is a lightweight utility that applies trigonometric laws to compute missing sides and angles in a triangle when you provide at least three known values. It exports a single main function, solve(), that takes any combination of side lengths (a, b, c) and angles (A, B, C) as keyword arguments and returns all six values. The package follows standard geometric convention: lowercase letters denote sides, uppercase denote angles, and corresponding letters are opposite each other.

The package has no runtime dependencies and installs as a pure Python wheel, making it trivial to add to any project. All angles are in radians by default, but a degree constant is provided for easy conversion. It is intended for educational use and scientific applications where quick triangle calculations are needed.

Use it for:

- Educational geometry or trigonometry exercises where students need to verify triangle solutions.
- Scientific simulations or engineering calculations requiring rapid triangle geometry resolution.
- Navigation or surveying applications where partial triangle measurements must be completed.
- Physics or mechanics problems involving triangular force diagrams or structural analysis.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Solves for unknown sides and angles of a triangle given partial information, using the law of sines and law of cosines.

Yes, if you need a simple, dependency-free triangle solver for educational or one-off scientific use. The low install friction and permissive license make it easy to add. However, the package is abandoned and receives no maintenance; do not rely on it for production systems or expect updates.

## Install

pip install trianglesolver
uv add trianglesolver
poetry add trianglesolver

## Installing trianglesolver

Before you install: Low install friction with no runtime dependencies. However, the package is abandoned—last release was 2020-04-10, with no active maintenance or updates since then.

License in practice: MIT license is permissive; you can use, modify, and distribute this package freely with minimal restrictions, though you must retain the license notice.

Quickstart:

from math import pi
from trianglesolver import solve, degree

# Solve with radians
a, b, c, A, B, C = solve(b=7.6, c=8.3, A=pi/3)

# Or convert using degree constant
result = solve(b=7, A=5*degree, B=70*degree)
print(result[2] / degree)  # angle C in degrees

Verify before relying:

- Whether the package handles all valid triangle configurations or has edge cases with degenerate inputs.
- Current compatibility with modern Python versions (classifiers list Python 2 and 3 but no specific version pins).

## Package facts

- License: MIT (permissive)
- Python support: unspecified
- Install friction: low
- Maintenance: abandoned
- Downloads: 414.5K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

triangle solver, law of sines cosines, trigonometry triangle calculation, find triangle sides angles, solve triangle geometry, trigonometric triangle solver, trigonometry, geometry, education

[View on SkillFed](https://skillfed.io/packages/trianglesolver) · [View on PyPI](https://pypi.org/project/trianglesolver/)