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Sanjay Chauhan · Answer 1 · 2018-08-13T15:31:03+0000

hello :
an equation of the circle Center at the A(a,b) and ridus : r is :
(x-a)² +(y-b)² = r²
in this exercice : a = 0 and b = 0 and r=3 (Center at the origin: A=O)is : x²+y² = 9

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