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.

## Standard equation of circle:

**Example:**

**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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parbhudayal says

thanks Mr Ling.

Huai Tian says

b

alwaysLovely says

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.

Sendeht Manji Ayuba says

am imprest but am not clear

anon says

I was expecting an actual derivation of the equation, than this.