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2018_2019学年高中数学第四章圆与方程4.1.2圆的一般方程情境导学素材新人教A版必修2.doc

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14.1.2 圆的一般方程【情境导学】已知圆心(2,3),半径为 2,请写出圆的标准方程.答案:(x-2) 2+(y-3)2=4.(1)上述方程能否化为二元二次方程的形式?(可以,x 2+y2-4x-6y+9=0)(2)若把圆的标准方程(x-a) 2+(y-b)2=r2展开后,会得出怎样的形式?(x2+y2-2ax-2by+a2+b2-r2=0)

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