# Trigonometry Calc: Triangles — Solve right triangles & angles

> Right-angled triangle calculator using trigonometry and Pythagorean theorem. (iPhone/iPad app by Bo Kalvslund.)

- Source: https://appshunter.io/ios/app/trigonometry-calc-triangles/id1306864057 (this page in markdown: same URL + `.md`)
- Developer: [Bo Kalvslund](https://appshunter.io/developer/572272193)
- Category: Education, Utilities
- Price: Free with in-app purchases
- Rating: 3.00/5 from 2 App Store ratings · 6 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 8 MB
- Languages: American English, Danish, German (Germany), Italian, Japanese, Brazilian Portuguese, European Spanish, Chinese (Traditional, Taiwan)
- Released: 2017-11-04
- Data updated: 2026-11-11
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/trigonometry-calc-triangles/id1306864057/reviews.md

## What is Trigonometry Calc?

Solve right triangles in seconds. Enter two values and Trigonometry Calc finds the missing side or angle.

CALCULATE SIDES
• Find side a, b or the hypotenuse c with the Pythagorean theorem
• Clear diagrams show which side you are solving for

CALCULATE ANGLES
• Find angle A from two sides using sine, cosine or tangent
• Results in degrees

ANY TRIANGLE – PREMIUM
• Solve triangles without a right angle using SAS, SSA and ASA
• See all missing sides and angles at once

LEARN THE THEORY
• The unit circle with sin, cos and tan explained
• An illustrated walk-through of the Pythagorean theorem
• All formulas the app uses, in one place

GOOD FOR
• Students in math, physics and technical subjects
• Homework and checking your own calculations
• Carpenters, builders and DIY projects that need angles and lengths

PREMIUM
One purchase removes all ads forever and unlocks the general triangle calculator. No subscription.

Works on iPhone and iPad.

## Key features

- Calculate side lengths
- Calculate angles
- Pythagorean Theorem
- Trigonometry functions
- Learn simple trigonometry
- General triangle calculator (premium)

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium | $0.99 | one-time |


## Is Trigonometry Calc safe?

Not enough ratings yet to assess Trigonometry Calc.

## Is Trigonometry Calc legit?

Trigonometry Calc: Triangles appears to be a legitimate app. The AppsHunter Legitimacy Score for Trigonometry Calc is 90 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (6 of 6)

All indexed reviews: https://appshunter.io/ios/app/trigonometry-calc-triangles/id1306864057/reviews.md

### 2/5 — Not quite there

*2022-05-30*

This is a nice and simple app to use but the font sizes are far too small to see the results clearly. This makes the app almost useless!

### 1/5 — N

*2020-09-28*

Deleted within 5 seconds after the first add popped up

**Developer response:** Sorry to hear that. I have changed the setup so it should be more user friendly. Regards Bo

### 2/5 — 3 ads fo one calculation...

*2020-09-06*

Too much ads for simple calculations.

**Developer response:** Thanks for your feedback. I have changed the frequence. Hope this is better. Regards Bo.

### 1/5 — Ilegible results.

*2020-03-13*

Can’t read answers with white type on yellow background.

**Developer response:** I’ll change the app to support Dark mode- Thanks!
Regards Bo

Update: now I have changed the layout. The text is readable now.
/Bo

### 1/5 — Trig is not the problem

*2019-07-06*

SSS
AAA
How about SAS
Just want a quick visual for the field. I give you a a length and an angle and you give me the hypotenuse. Well, this program doesn't do that.

### 2/5 — Not helpful enough

*2019-05-15*

I'm a high schooler who was just trying to get some work done on my assignments but I forgot my good calculator at home. This calculator doesn't help if you need angles and sides in the same calculation. It has 3 uses, shows the Pythagorean Theorem, calculates one angle given the other angle, and calculates on side given two other sides. It also uses decimals instead of fractions.

## Frequently asked questions about Trigonometry Calc

### What can Trigonometry calc calculate?

Trigonometry calc can calculate side lengths and angles in right-angled triangles using the Pythagorean theorem and various trigonometry functions. The premium version extends this to solve any triangle.

### Is Trigonometry calc free to use?

Yes, Trigonometry calc is free to download and use. It does contain advertisements, and an in-app purchase is available to remove ads and unlock advanced features.

### Does Trigonometry calc have ads?

Yes, Trigonometry calc contains advertisements. Users can opt to purchase Trigonometry Premium to go ad-free permanently.

### What devices is Trigonometry calc available on?

Trigonometry calc is available on iPhone, iPad, and iPod devices.

### How often is Trigonometry calc updated?

The latest version of Trigonometry calc is 2.4, last updated on January 23, 2026. This indicates regular updates to improve functionality and features.

### What is the user rating for Trigonometry calc?

Trigonometry calc has a rating of 3.0 stars based on 2 ratings. This suggests a mixed but generally positive reception from its user base.

### What age rating is Trigonometry calc?

Trigonometry calc has an age rating of 4+, making it suitable for a wide range of users, including younger learners.

### Can Trigonometry calc solve general triangles, not just right triangles?

The free version of Trigonometry calc is designed for right-angled triangles. The advanced General Triangle Calculator, which solves any triangle (SAS/SSA/ASA), is unlocked via an in-app purchase.

## Version history (last 5 releases)

### 2.5 — 2026-11-07

NEW THEORY SECTION
• Unit circle – drag the angle and watch sin, cos and tan change
• Pythagoras' proof – follow the proof of a² + b² = c² step by step
• Formulas – every formula for the right triangle in one place

• Improvements and bug fixes

### 2.4 — 2026-01-23

• Trigonometry Premium – Remove all ads forever with a  
  single purchase                                         
                                                          
  • General Triangle Calculator – Solve any triangle with 
  SAS, SSA, and ASA methods (Premium feature)             
                                                          
  • Full English language support                         
                                                          
  • Performance improvements and bug fixes

### 2.3 — 2025-02-13

Updated for new operating system.
Dependencies updated.

### 2.2 — 2025-01-22

Updated for new operating system

### 2.1 — 2024-02-28

Updated for new screen sizes.

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All apps by Bo Kalvslund: https://appshunter.io/developer/572272193

## Related topics

[trigonometry calc](https://appshunter.io/ios/topics/trigonometry-calc) · [trigonometry calculator sincos](https://appshunter.io/ios/topics/trigonometry-calculator-sincos) · [trigonometry help lite](https://appshunter.io/ios/topics/trigonometry-help-lite)

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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 2026-11-11.*