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 teachers and students 🎓
• Construction and carpentry projects 🚧
• Navigation and orienteering ⛵
• Machinists and engineers ⚙️
• Physics, math, and astronomy 🪐
• Surveying 🌲
• Anyone solving triangles 📐

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

Key Features: 🔑
• Identify and solve ambiguous triangles.
• Partial solutions. (e.g. Base and height alone solves for area)
• Inverse calculations. (e.g. Enter area and height to solve for base)
• Translate, rotate, reflect and scale transformations.
• Categorize scalene, isosceles, equilateral triangles.
• Categorize acute, right, and obtuse triangles.

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

Numeric Features: 1️⃣2️⃣3️⃣
• 15 angle units. (deg°, rad, d°m's", % grade, 𝜏, +...)
• Metric, SAE, and universal length units.
• Automatic unit conversion.
• Long press icon expression entry (e.g. 7 + 5/12).
• Configurable precision.
• Optional zero and negative geometry.
• Numerically stable trigonometry extremes.
• Integrated xy and rθ coordinate systems.

Interface Features: 📱
• Right triangle fast entry by long pressing angle icon.
• Individual value memory.
• Numeric and graphic relationship visualization.
• Adjust values without clearing or pressing calculate key.
• Automatic triangle solution type detection.
• Dynamic adjustment of field sizes.
• Live and restorable settings.
• Visually educational icons.
• Dark background to reduce eye strain.
• Portrait and landscape layouts.
• Tabbed display option.
• Save and restore triangles.

Additional Features: 📎
• No ads.
• No In-app purchases.
• No subscription costs.
• No app permissions.
• No internet required after download.
• Free email support.

You have found the best triangle solver.

(⭐) Contact the developer by email to request a promotion code for your 100% free and fully functional download. Your email will not be sold or shared.

✉️: [e-mail]

Paid downloads help keep the app ad-free and are donations.

Reviews with constructive feedback are appreciated and help improve the app.

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 is an amazing app. It gives an actual visual representation of the values I enter and modify. I have not tried any app that comes close to this. I love the privacy policy. Thank you for this excellent 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.

What’s new

Free. Read "About this app" for details.