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Tiblu · Answer 1 · 2018-10-22T09:32:15+0000

hello :
(x² - 4x )+( y² - 4y) - 73 = 0
(x² - 4x+4-4 )+( y² - 4y+4-4) - 73 = 0
(x² - 4x+4)-4 +( y² - 4y+4)-4 - 73 = 0
(x-2)² +(y-2)² = 9²

the radius is : 9

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