Trisolve: Triangle Calculator

Mitch Besser

About this app

Free💲 (see ⭐ below)

The only triangle solver that draws the values you enter AND enters the values you draw.

Perfect For:
• Geometry students and teachers 🎓
• Machinists and engineers ⚙️
• Astronomers 🪐
• Surveyors 🌲
• Construction and carpentry projects 🚧
• Navigation and orienteering ⛵
• Anyone solving triangles 📐

Both solve for AND ENTER: ✅
• Sides
• Angles
• Vertices
• All 3 Heights
• Perimeter
• Area
• Multiple Centers

Key Features: 🔑
• Solve ambiguous triangles.
• Categorize scalene, isosceles, equilateral triangles.
• Categorize acute, right, and obtuse triangles.
• Inverse solutions.
• Partial solutions.
• Translate, rotate, reflect and dilate transformations.

Drawing Features: ✏️
• User drawable sides, angles and vertices.
• Automatic viewport center, zoom and orientation.
• Precision aware drawing granularity.
• Axis lock on xy and rθ vertices.
• Zoom and pan graphics.

Numeric Features: 1️⃣2️⃣3️⃣
• 15 angle units. (deg°, rad, d°m's", % grade, tau, ...)
• Metric, SAE, and universal length units.
• Automatic unit conversion.
• Configurable precision.
• Optional zero and negative geometry.
• Numerically stable trigonometry.
• Integrated xy and rθ coordinate systems.

Interface Features: 📱
• Long press any angle icon for right triangle.
• Data value expressions (e.g. 7 + 9/32).
• Individual value memory.
• Numeric and graphic relationship visualization.
• Solve without pressing a calculate key.
• Automatic side and angle entry detection.
• Dynamic adjustment of field sizes.
• Live settings.
• Visually descriptive and functional icons.
• Dark background to reduce eye strain.
• Portrait and landscape displays.
• Tabbed display lecture option.
• Save and restore triangles.

Additional Features: 📎
• No ads.
• No In-app purchases.
• No subscription costs.
• No app permissions.
• No internet required after download.
• Available in over 35 languages.
• Free download days.
• Free email support.

You have found the best triangle solver.

(⭐) Contact the developer by email and request a promotion code for your 100% free and fully functional download. No ads, no upsells, no strings, ... just free. Your email will not be sold or shared.

✉️: [e-mail]

All store purchases are considered donations and help keep the app ad free.

Reviews with constructive feedback help improve the app. Positive rankings help promote the app in underserved communities.

In memory of my geometry teacher Mr. Robert Wegner.

Ratings and reviews

Awesome app. It does not get much better than this when comes to solving triangles. Being able to see the triangle change shape according to the inputs is so helpful. It can even tell if a triangle has no, one, or two solutions. It is very snappy with virtually no loading or wait time. I think that having an option to toggle and be able to change the POV by pinching the screen and turning either CW or CCW would make it more intuitive. But overall, a really good app.

This interface allows the user to draw a triangle and manipulate the shape for learning purposes. I have not seen this feature on other triangle solvers.

Awesome! Great app :) excellent and A very useful tool.

What's new

Free November 25-30