Triangle Solver: Free AI Help for Sides, Angles & Area
Triangles are one part of the geometry and trigonometry curriculum. For algebra and more, visit the full AI Math Solver.
Missing a side, an angle, or the area of a triangle? Our free triangle solver no sign up tool identifies whether you need the Pythagorean theorem, the Law of Sines, or the Law of Cosines, then walks through the calculation step by step.
How to Use the Triangle Solver
Every triangle problem has a right tool for the job. Our solver picks it and shows exactly how it's applied.
Input What You Know
Type in the known sides and angles of your triangle and what you need to find.
Upload for Instant Analysis
Snap a photo of your triangle diagram or worksheet and the solver will read and process it automatically.
Step-by-Step Breakdown
See the correct theorem or law selected and applied step by step, not just the final side or angle.
What Our Triangle Solver Covers
From right triangles to oblique ones, this solver covers the full range of triangle problems taught in K-12 math.
Pythagorean Theorem
Find a missing side of a right triangle and check whether a triangle is a right triangle.
Law of Sines
Solve for missing sides or angles in any triangle when you know two angles and a side, or two sides and an angle.
Law of Cosines
Solve for a missing side or angle when you know three sides, or two sides and the included angle.
Area of a Triangle
Calculate area using base and height, or Heron's formula when only the three sides are known.
Congruence & Similarity
Prove triangles congruent or similar using SSS, SAS, ASA, and AA criteria.
Special Right Triangles
Work with 30-60-90 and 45-45-90 triangles using their fixed side-length ratios.
Triangle Support for Every Student, Anytime
Triangle problems evolve from the Pythagorean theorem to full trigonometric laws. Our tool matches the method to your level.
Middle School: The Pythagorean Theorem
Master finding a missing side of a right triangle and recognizing right triangles from side lengths.
High School: Law of Sines & Cosines
Solve any triangle, not just right triangles, using the Law of Sines and Law of Cosines.
College: Applied Trigonometry
Apply triangle-solving methods in precalculus, physics, and engineering-style problems.
Get Instant Help with Triangle Assignments
Whether it's a right triangle or an oblique one, get the correct method and a full explanation every time.
Problem Sets
Quizzes & Tests
Word Problems
Worksheets
Get Triangle Homework Help Anytime, Anywhere
Ready to know exactly which formula to reach for? Use our free Triangle Solver today.
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Need Help Beyond Triangles?
Our AI is fine-tuned for the unique logic of each discipline. Select a subject below to calibrate the solver for specific terminology and academic standards.
Used by students globally for standardized exam preparation and daily assignments.