圆的方程式是什么？
\u5706\u7684\u65b9\u7a0b\u5f0f\u662f\u4ec0\u4e48\uff1f\u5706\u5fc3(a,b)\uff0c\u534a\u5f84r
(x-a)²+(y-b)²=r²
圆心(a,b)，
半径r
(x-a) ^2+(y-b)^2 =r ^2
去翻高中数学数，这个都不知道？
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