Right Angle

Right Angle

Triangles, trapezoids, circles

30 ratings
86 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • October 4, 2008
  • July 10, 2026

Features

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iphone
ipad
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About

This app calculates triangles and segments of circles. It supports various angle input formats and offers solutions for oblique triangles and circle segments with optional add-ons. A right triangle calculator is included for free.

Triangle solver
Circle segment calculator
Multiple angle units (degrees, radians, DMS, grade, x/12)
Oblique triangle solver (add-on)
Circle segment solver (add-on)
Free right triangle calculator
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What's New in Right Angle

6.0.1

July 10, 2026

Bug fixes

Subscription plans

Renews Monthly

Most flexible

$2.991 Month
14 Days trial
Price Updates
July 13, 2026$2.99
June 15, 2026$3.99
November 18, 2024$1.99
How to cancel Right Angle subscription ⁉️
4

In-App Purchases

$5.99

Segments Calculator

Unlocks segment of a circle calculation

User reviews

Recently Useless

We needed an app that handled imperial measurements in fractions. This was it until now. i can interpret decimals to fractions in my head but this app does neither to provide answers. What was once useful & unique is now useless & DELETED! goodbye!

Most recent update ruined this app

This app was 5 stars for the years I’ve used it but when I opened it yesterday and seen the option for feet and inches on the calculator was removed I was disappointed and now I have to convert all my measurements to decimals and back to get accurate measurements, I might as well just use the formula on my pipe trades calculator.
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WHY

WHY DID YOU REMOVE THE FRACTIONS….INSTEAD OF UPDATING IT YOU SET THE APP BACKWARDS

Response from developer

Very few users were using fractions, and it greatly complicated number input and accuracy.

Best Angle App

Been using this App for well over 10 years now makes my job so much easier.

Changed for the worse

Used this app for a long time because it would figure both of the angles of a right triangle but the app was updated and now it only provides one.

Response from developer

It does show both angles of a right triangle. There is an angle A & angle C field just below it.

FAQ

What does the Right Angle app do?

Right Angle is a specialized calculator designed to solve problems related to triangles and segments of circles. It allows users to input angles in various formats and provides solutions for different types of triangles and circle segments.

What are the key features of Right Angle?

Key features include a triangle calculator, a circle segment calculator, and support for multiple angle units like degrees, radians, degrees minutes seconds, % grade, and x over 12. The right triangle calculator is included for free, with optional add-ons for oblique triangles and more complex circle segments.

Is Right Angle free to use?

The core functionality, including the right triangle calculator and basic angle calculations, is free. However, advanced features like solving oblique triangles and segments of circles require optional add-ons, which are available through in-app purchases.

What types of angles can be entered?

The app supports a wide range of angle input formats. You can enter angles in degrees, radians, degrees minutes seconds, % grade, and x over 12. This flexibility caters to various mathematical and engineering needs.

Who would benefit from using this app?

This app is beneficial for students learning geometry and trigonometry, engineers working on design and construction projects, and anyone who frequently needs to perform precise calculations involving triangles and circles.