圆C1:X*X+Y*Y+2Y-6Y-26=0与圆C2:X*X+Y*Y-4X+2y+4=0的公切线有多少条
问题描述:
圆C1:X*X+Y*Y+2Y-6Y-26=0与圆C2:X*X+Y*Y-4X+2y+4=0的公切线有多少条
答
(x+1)^2+(y-3)^2=6^2
(x-2)^2+(y+1)^2=3^2
圆心距离5,6-3