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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thanks Mr Ling.

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alwaysLovely Reply:

January 19th, 2010 at 10:55 pm

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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[...] A-Math: Standard Equation of Circle – Derived from Distance Formula [...]

am imprest but am not clear

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

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