# Arbitrary Triangle PRO — Calculates all quantities

> Calculates all quantities of an arbitrary triangle with step-by-step solutions. (iPhone/iPad app by Glindemann, Sennoun, Langer GbR.)

- Source: https://appshunter.io/ios/app/arbitrary-triangle-pro/id1617819308 (this page in markdown: same URL + `.md`)
- Developer: [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809)
- Category: Education, Utilities
- Price: $2.99
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 15.0 · 182 MB
- Languages: American English, French (France), German (Germany), Hindi, Indonesian, Japanese, Korean, Brazilian Portuguese, Russian, Chinese (Simplified, China) and 1 more
- Released: 2022-04-16
- Data updated: 2026-08-19
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/arbitrary-triangle-pro/id1617819308/reviews.md

## What is Arbitrary Triangle PRO?

The best app to calculate all quantities of an arbitrary triangle. You must enter some quantities like two angles and one length. The algorithm searches the formulas of the missing quantities, shows them and calculates the results.

The length of the decimal place can be changed. The algorithm shows when rounding or wrong values lead to an opposition.

Decimals and fractions are supported. The solution is shown step by step. All calculations are stored in the history. The final solution can be shared.

[ Contents ]
- all important quantities for the arbitrary triangle
- formulas for all important quantities of an arbitrary triangle
- infographic to illustrate the topic
- search bar to find the desired quantity
- history function to save the input
- detailed solution
- positive numbers, decimals and fractions are supported
- no ads!

[ Usage ]
- there are fields for entering values using a special keyboard
- press the check mark button at the bottom right to start the calculation
- if values are missing, all fields will be marked orange
- if the values are wrong (e.g. negative lengths), the affected field will be highlighted red
- if a value is no number, it is highlighted in red
- the entries in the history can be deleted or sorted
- if you select an entry in the history, it will be automatically loaded for the calculation
- the whole history can be deleted by pressing a button
- solutions can be shared

[ Math conditions ]
- each value must be greater than zero
- each angle must be less than 180°
- the sum of two sides must always be greater than the length of the third side

## Key features

- Calculates all triangle quantities
- Displays formulas used
- Step-by-step solutions
- Supports decimals and fractions
- Calculation history
- Shareable solutions


## Frequently asked questions about Arbitrary Triangle PRO

### What quantities can Arbitrary Triangle PRO calculate?

Arbitrary Triangle PRO calculates all important quantities for an arbitrary triangle, including sides, angles, area, and perimeter. It provides the specific formulas used for each calculation.

### Does Arbitrary Triangle PRO support fractions and decimals?

Yes, Arbitrary Triangle PRO supports both decimals and fractions for input values. It also allows you to change the length of decimal places for the results.

### How does Arbitrary Triangle PRO handle incorrect or invalid input?

The app highlights fields with incorrect values in orange if they are missing or red if they are invalid (e.g., negative lengths, non-numeric input). It also flags when rounding or wrong values lead to contradictions.

### Can I review past calculations with Arbitrary Triangle PRO?

Yes, all calculations are stored in a history function. You can delete, sort, or select entries from the history to automatically load them for further calculations.

### Is Arbitrary Triangle PRO suitable for offline use?

The provided description does not specify offline functionality. However, as a calculation tool, it is likely designed to work without an internet connection once installed.

### What are the mathematical conditions for input values in Arbitrary Triangle PRO?

Each value must be greater than zero, each angle must be less than 180°, and the sum of any two sides must be greater than the length of the third side.

### Does Arbitrary Triangle PRO have ads?

No, Arbitrary Triangle PRO is ad-free. The description explicitly states 'no ads!'.

### How often is Arbitrary Triangle PRO updated?

The app was last updated on June 3, 2026, with version 2.2.9. This indicates a recent update, suggesting ongoing support and development.

## Version history (last 5 releases)

### 2.3.4 — 2026-08-14

The latest release 'Least common multiple' is linked in the menu section now.

Minor performance and UI fixes.

### 2.3.3 — 2026-08-04

- the status bar on top is integrated into the current app design
- the app flow was improved (pop-up information was balanced)

### 2.3.2 — 2026-07-17

Maintenance update. Improving performance.

### 2.3.0 — 2026-06-19

Bringing all apps to the same security standard. Critical storage behaviour for solutions has been fixed.

By the way - I run many apps with different math topics. If you like this one: Check them out as well!

I always do my best to keep a high standard on my apps. If something does not meet the expectations, do not hesitate to contact me.

### 2.2.10 — 2026-06-06

There were some major fixes and adjustments for a more stable behaviour of the solution storage and loading. Therefore some database changes were made in the background. There are no performance losses and the functionality does not change. The background tasks are only done once within milliseconds. Following behaviour may occur (only temporary):
- stored calculations have to be tapped twice to load fully
- the order of the stored solutions may change

If there are some losses of solutions do not hesitate to contact me and tell me the number of lost solutions + affected app. I will find a solution for this.

Kind regards, Alex (the Dev)

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All apps by Glindemann, Sennoun, Langer GbR: https://appshunter.io/developer/1024972809

## Related topics

[isosceles triangle pro](https://appshunter.io/ios/topics/isosceles-triangle-pro)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-19.*