Edexcel A Level Maths: Pure:復習筆記3.2.2 Finding the Centre & Radius
Finding the Centre & Radius
How can I find the centre and radius from any form of the equation of a circle?
- A circle equation in a different form can always be rearranged into?(x-?a)2?+?(y?-?b)2?=?r2?form in order to find the centre and radius
- This will often involve?completing the square
Exam Tip
Make sure you are able to rearrange circle equations given in the general form 
?
Worked Example
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