Circles and Equations
The tutor in your pocket.
$0.99
7.3for iPhone, iPad
Age Rating
Circles and Equations Screenshots
About 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.
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.
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What's New in the Latest Version 7.3
Last updated on Apr 9, 2024
Old Versions
This version contains minor bug fixes.
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Version History
7.3
Apr 9, 2024
This version contains minor bug fixes.
7.2
Apr 1, 2024
iOS 17 compatibility and minor bug fixes.
7.1
Dec 11, 2022
This version has minor bug fixes.
7.0
Sep 14, 2022
This version has iOS 16 compatibility and minor bug fixes.
6.9
Nov 5, 2021
iOS 15 compatibility and user interface improvements. Minor bug fixes.
6.8
Jun 8, 2021
New practice option and enhanced user interface.
6.7
Jan 23, 2020
Minor bug fixes and enhancements.
6.6
Jan 15, 2020
Minor bug fixes and app streamlining. Secondary modules are moving to free apps for you to GET if you wish.
6.5
Sep 26, 2019
Dark mode bug fixes.
6.4
Sep 25, 2019
iOS 13 and iPadOS compatibility.
6.3
Jan 21, 2019
Major revision with streamlined user interface. Minor bug fixes.
6.2
Sep 21, 2018
Universal iPhone and iPad app. iOS 12 compatibility,
6.1
Nov 1, 2017
iPhone X and iOS 11 optimization and minor bug fixes.
6.0
Sep 16, 2016
iOS 10 compatibility and bug fixes.
5.1
Sep 26, 2015
iOS 9 compatibility and bug fixes.
5.0
Apr 3, 2015
Improved Guides for iPhone 6 and iPhone 6 Plus and minor bug fixes.
4.0
Sep 26, 2013
iOS 7 version.
3.2
Feb 15, 2013
iPhone 5 optimization and minor bug fixes.
3.1
Sep 26, 2012
iOS 6 and iPhone 5 compatibility.
3.0
Aug 11, 2012
Coaching Calculator for finding center and radius. New compact design.
2.2
Jan 8, 2011
Minor bug fixes.
2.1
Dec 17, 2010
Minor bug fixes and layout changes.
2.0
Nov 2, 2010
New menu system. Minor bug fixes.
1.5
Jul 9, 2010
iOS 4 compatibility. Minor bug fix.
1.4
Mar 26, 2009
New example of finding the equation of a tangent line.
Circles and Equations FAQ
Click here to learn how to download Circles and Equations in restricted country or region.
Check the following list to see the minimum requirements of Circles and Equations.
iPhone
Requires iOS 16.0 or later.
iPad
Requires iPadOS 16.0 or later.
Circles and Equations supports English
