查看完整版本 : 圆与球

JYSim98 2015-9-29 08:20 PM

圆与球

求圆心(-3,0)且将圆x²+y²+2x-4y+1=0的圆周加以平分的圆的方程式。
Ans:x²+y²+6x-3=0
本人无法了解此题目“圆周加以平分”,求解释…
是要找圆的周长先吗???



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mathtsang 2015-9-30 12:30 PM

If the circle intersect the circle x2+y2+2x-4y+1=0 at two end points of its diameter, then of course it cut the circumference into half.
May be you can draw a diagram to help yourself to solve the problem.

JYSim98 2015-9-30 05:25 PM

Thank you very much!
Now,I know how to solve it^^



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