# Circles and Equations — The tutor in your pocket. > Educational tool for mastering circle equations and completing the square. (iPhone/iPad app by Walter Kissach.) - Source: https://appshunter.io/ios/app/circles-and-equations/id293619582 (this page in markdown: same URL + `.md`) - Developer: [Walter Kissach](https://appshunter.io/developer/293232788) - Category: Education, Reference - Price: $0.99 - Rating: 1.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 18.0 · 2 MB - Languages: English - Released: 2008-10-16 - Data updated: 2026-06-25 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/circles-and-equations/id293619582/reviews.md ## What is Circles and Equations? A power learning aid combines Coaching Calculator, Practice and Guide to help students master finding the center and radius of a circle by completing the square. Develop skills with the Coaching Calculator as you find the center and radius of a circle step by step, - Taking constant term to right hand side - Grouping x-related and y-related terms - Completing the squares - Writing in center-radius form or go straight to a particular step. Check your progress with Practice as it presents you with circle equations from simple to more difficult. Reference the Guide as it features step-by-step examples of circle equations where the coefficient of x² is one and not equal to one. Applications include finding the equation of a tangent line at a a given point on a circle and determining if a given point is inside a circle. ## Key features - Coaching Calculator for step-by-step guidance - Practice exercises with varying difficulty - Guide with detailed examples - Completing the square method - Finding center and radius - Tangent line calculation - Point-in-circle determination ## Frequently asked questions about Circles and Equations ### What is the learning methodology of Circles and Equations? Circles and Equations employs a multi-faceted approach including a coaching calculator for guided practice, a practice module for skill reinforcement, and a reference guide with detailed examples. This ensures students can learn at their own pace and revisit concepts as needed. ### How does Circles and Equations help track progress? The 'Practice' section of Circles and Equations presents users with a range of circle equations, from simple to more difficult. By working through these exercises, users can gauge their understanding and identify areas that may require further attention. ### Does Circles and Equations offer certifications? Circles and Equations is designed as a learning aid to help students master specific mathematical concepts. It does not currently offer formal certifications upon completion of its modules. ### What is the price of Circles and Equations? Circles and Equations is available for a one-time purchase of $0.99. This price grants users full access to all features without any recurring subscription fees. ### Is Circles and Equations suitable for younger students? Circles and Equations has an age rating of 4+, making it accessible for a wide range of users. Its focus on mathematical concepts may be more relevant for students in middle school and above. ### How often is Circles and Equations updated? The latest version of Circles and Equations is 7.4, last updated on September 17, 2025. This indicates a commitment to maintaining and potentially improving the application over time. ### What devices support Circles and Equations? Circles and Equations is compatible with both iPhone and iPad devices. This allows for flexible learning across different Apple mobile platforms. ### Does Circles and Equations have ads? Circles and Equations is ad-free. Users can engage with the learning material without any interruptions from advertisements. ## Version history (last 5 releases) ### 7.4 — 2025-09-17 This version is iOS 18 compatible and contains minor bug fixes. ### 7.3 — 2024-04-09 This version contains minor bug fixes. ### 7.2 — 2024-04-01 iOS 17 compatibility and minor bug fixes. ### 7.1 — 2022-12-11 This version has minor bug fixes. ### 7.0 — 2022-09-14 This version has iOS 16 compatibility and minor bug fixes. ## Apps similar to Circles and Equations | App | Rating | Price | Category | | --- | --- | --- | --- | | [Smart Belarusian Dictionary](https://appshunter.io/ios/app/smart-belarusian-dictionary/id1606872160) | 3.0 (1) | Free | Education | | [Zuokabi: Learn Spanish](https://appshunter.io/ios/app/zuokabi-learn-spanish/id1615570420) | 5.0 (22) | Free | Education | | [NSE Panthers](https://appshunter.io/ios/app/nse-panthers/id1611182360) | 4.7 (3) | Free | Education | | [Wanna help word memorization](https://appshunter.io/ios/app/wanna-help-word-memorization/id1608671720) | — | Free | Education | | [A-Level Biology App](https://appshunter.io/ios/app/a-level-biology-app/id1613078220) | 1.0 (1) | Free | Education | | [CiNii Research, KAKEN, IRDB](https://appshunter.io/ios/app/cinii-research-kaken-irdb/id1618150440) | — | Free | Education | ## More apps by Walter Kissach - [Quadratic Inequalities](https://appshunter.io/ios/app/quadratic-inequalities/id293232785) - [Even and Odd Polynomials](https://appshunter.io/ios/app/even-and-odd-polynomials/id293668394) - [Quadratic Factoring](https://appshunter.io/ios/app/quadratic-factoring/id294040055) - [Quadratic Equations](https://appshunter.io/ios/app/quadratic-equations/id294195555) - [20/20 Fraction Basics](https://appshunter.io/ios/app/2020-fraction-basics/id298766849) All apps by Walter Kissach: https://appshunter.io/developer/293232788 --- *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 2026-06-25.*