AQA A Level Maths: Pure复习笔记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

3.2.2-Circle-Ctr-Rad-Illustr-1

Exam Tip

Make sure you are able to rearrange circle equations given in the general form 3.2.2-Circle-Ctr-Rad-general-illustr

 

Worked Example

3.2.2-Circle-Ctr-Rad-Example

转载自savemyexams

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