A-Math: Standard Equation of Circle - Derived from Distance Formula

I notice many students had a hard time making sense of the standard equation of circle which is nothing new! The standard equation of circle is simply the Distance formula learnt in Coordinate Geometry in E-Math and A-Math.

Diagram for Standard Eqn of Circle
Diagram for Standard Eqn of Circle

Standard equation of circle:




Test Yourself:

To ensure you have understood the standard equation of circle, attempt the question below by selecting the correct option and leave your answer in the comments section.


In my future post, I'm going to discuss the other type of equation of circle: General equation of circle.

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Hi, I'm Ai Ling Ong. I enjoy coaching students who have challenges with understanding and scoring in 'O' Level A-Maths and E-Maths. I develop Math strategies, sometimes ridiculous ideas to help students in understanding abstract concepts the fast and memorable way. I write this blog to share with you the stuff I teach in my class, the common mistakes my students made, the 'way' to think, analyze... If you have found this blog post useful, please share it with your friends. I will really appreciate it! :)

6 Responses to A-Math: Standard Equation of Circle - Derived from Distance Formula

  1. b


    alwaysLovely Reply:

    Thanks for your participation.
    Your answer is absolutely correct!
    Keep up the good work.

    I'll be writing another post on Eqn of circle Part 2. Subscribe to be updated of latest post.


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