# SineCosine

> Calculates non-right-angled triangle angles and sides with detailed workings. (iPhone/iPad app by Essence Computing.)

- Source: https://appshunter.io/ios/app/sinecosine/id372185214 (this page in markdown: same URL + `.md`)
- Developer: [Essence Computing](https://appshunter.io/developer/333177404)
- Category: Education, Utilities
- Price: $0.99 with in-app purchases
- Rating: 3.50/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.0 · 8 MB
- Languages: American English
- Released: 2010-05-18
- Data updated: 2026-08-16
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/sinecosine/id372185214/reviews.md

## What is SineCosine?

Do you need to learn how to determine the angles and lengths of a non-right-angled triangle?  Need to understand how to apply the Sine and Cosine rules in this case?  Need to know how to calculate the other sides and angles when you know one angle and two sides or two angles and one side or even no angles and all three sides?  If the answer is Yes to any of these questions then this App is for you.  The Sine/Cosine Calculator not only calculates the answers for you but it also tells you how it did it so you can understand how and when to apply the rules for non-right angle triangles.

The App is simple to use.  Just enter the known angles and sides and all the others will be calculated for you.  To see how the answers were arrived at just select the 'Workings' button and a page is shown with a comprehensive set of steps to show how each was calculated.

To enter a value for an angle or a side just touch the diagram on or near the one you want to specify.  The keypad pops up.  Enter the value you want and select OK.   

The App can calculate the answers if you specify a) two angles and a side, b) two sides and the opposite angle, c) 2 sides and the included angle or d) all three sides.

To start over select 'Clear All'.  All values are reset.

## Key features

- Calculates non-right-angled triangle angles and sides
- Explains Sine and Cosine rule applications
- Step-by-step workings for calculations
- User-friendly input via diagram touch
- Supports various input combinations (angles/sides)

## Pricing and in-app purchases

Base price: $0.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Purchase Angles Calculator | $0.99 | one-time |
| Purchase Fractions Calculator | $0.99 | one-time |
| Purchase Fractions/Decimal Calculator | $0.99 | one-time |
| Purchase Averages Calculator | $0.99 | one-time |
| Purchase Spread Add On | $0.99 | one-time |
| Offer Two - Buy All | $1.99 | one-time |
| Offer Three - Buy All | $2.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/sinecosine/id372185214/reviews.md

### 2/5 — Great idea and could be a diamond

*2014-09-15*

This is a decent app, but could be great. It's missing some decimal placement and there is no way to input radicals and keep radicals in the standard form. If this happens, it will be the best app for trig and pre-cal

### 3/5 — Ambiguous case fail

*2011-07-27*

This app doesn't properly deal with or explain the ambiguous case for finding angles that may be acute or obtuse.

## Frequently asked questions about SineCosine

### What types of triangle problems can SineCosine solve?

SineCosine is designed to solve problems involving non-right-angled triangles. It can calculate missing angles and sides when you provide specific known values, such as two angles and a side, or two sides and an angle.

### How does SineCosine show its calculations?

SineCosine provides a 'Workings' button that displays a comprehensive set of steps. This allows users to understand the exact method used to arrive at each calculated answer.

### What input combinations does SineCosine support for calculations?

SineCosine supports calculations when you specify two angles and one side, two sides and the opposite angle, two sides and the included angle, or all three sides of the triangle.

### Is SineCosine available on Android devices?

Based on the provided data, SineCosine is supported on iPhone and iPad. Information regarding Android compatibility is not available.

### How often is SineCosine updated?

The latest version of SineCosine is 1.10, and it was last updated on May 24, 2023. This indicates a relatively recent update frequency.

### What is the age rating for SineCosine?

SineCosine has an age rating of 4+, making it suitable for a wide range of users, including younger students learning about geometry.

### Does SineCosine have ads?

No, SineCosine does not contain advertisements. The app is ad-free, providing an uninterrupted user experience.

### What is the price of SineCosine?

SineCosine is a paid application, available for $0.99. This one-time purchase grants access to all its features.

## Version history (last 5 releases)

### 1.10 — 2023-05-24

Updates for new screen sizes

### 1.9 — 2019-12-12

Updated the user interface

### 1.8 — 2017-09-14

UI updates to handle larger screens better

### 1.7 — 2013-09-27

Some bug fixes
Added ability to purchase the other calculators

### 1.6 — 2013-09-12

Added decimal point selector.  Can select from 2 to 5 decimal places.

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## More apps by Essence Computing

- [Weight Monitor](https://appshunter.io/ios/app/weight-monitor/id333177401)
- [Alcohol Units Calculator](https://appshunter.io/ios/app/alcohol-units-calculator/id339966988)
- [Depth Of Field Calculator](https://appshunter.io/ios/app/depth-of-field-calculator/id356339910)
- [Exposure Calculator](https://appshunter.io/ios/app/exposure-calculator/id359149599)
- [Fractions Calculator](https://appshunter.io/ios/app/fractions-calculator/id365570678)
- [Fractions/Decimals/Fractions](https://appshunter.io/ios/app/fractionsdecimalsfractions/id366955739)

All apps by Essence Computing: https://appshunter.io/developer/333177404

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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 2026-08-16.*