回复：挑战题: 垂心的轨迹问题
15少
2010-04-24 11:24:19
( reads)
|y|=(R^2-x^2-C) / sqrt(R^2-x^2) , |x|
C=(R-1)*(R+2)
|y|=(R^2-x^2-C) / sqrt(R^2-x^2) , |x|
C=(R-1)*(R+2)
15少
2010-04-24 13:38:00改错：C=（R+1)*(R-1)