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## Homework Statement

The circle C, with the centre at the point A, has equation x² + y² - 10x + 9 = 0

Find:

a) the co-ordinates of A,

b) the radius of C

## Homework Equations

(x-a)² + (y-b)² = r²

## The Attempt at a Solution

... not sure what to do really. any suggestions

thanks :)