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Triangle Calculator

Solve for missing sides, angles, and area of any triangle. Supports SAS, SSS, ASA, and AAS scenarios.

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Solve Any Triangle Instantly

Stuck on a geometry problem? Our Triangle Calculator solves for all missing sides and angles using just three known values. Whether you have Side-Angle-Side (SAS) or Side-Side-Side (SSS), this tool applies the Law of Sines and Law of Cosines automatically. It's the ultimate homework helper for students and a practical tool for carpenters, architects, and designers working with angular layouts.

Area and Perimeter Calculated

Beyond just solving dimensions, this tool instantly calculates the area (using Heron's Formula) and perimeter of your triangle. Visualizing the relationship between internal angles and side lengths helps deepen your understanding of trigonometry. From checking roof pitches to surveying land, if it has three sides, this calculator can solve it.

Math Fact: The sum of angles in any planar triangle is always exactly 180 degrees. This fundamental rule (Euclidean geometry) is what allows us to solve for a missing angle simply by subtracting the other two!

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