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# C1 AQA circle geometry watch

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1. A circle has a centrre C(-5,6)

Find the equation of the circle in the form: (x-a)^2+(y-b)^2=r^2

I understand up to (x+5)^2+(y-6)^2 but I don't understand how to get r^2
2. (Original post by AndyOC)
A circle has a centrre C(-5,6)

Find the equation of the circle in the form: (x-a)^2+(y-b)^2=r^2

I understand up to (x+5)^2+(y-6)^2 but I don't understand how to get r^2
3. (Original post by AndyOC)
A circle has a centrre C(-5,6)

Find the equation of the circle in the form: (x-a)^2+(y-b)^2=r^2

I understand up to (x+5)^2+(y-6)^2 but I don't understand how to get r^2
With this information, you can't calculate r^2.

Posted from TSR Mobile
4. Don't worry I've worked out now didn't realise that you had to work it out from the diagram I was given

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Updated: January 9, 2015
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