1)圆心C(t,2t)
C到直线距离D
D^2=R^2-(4√2/2)^2=2
D^2=(|t-2t|/√2)^2=2
t=2或t=-2
c(2,4)或c(-2,-4)
方程:
(x-2)^2+(y-4)^2=10或
(x+2)^2+(y+4)^2=10
2)
是圆心(2,4)(-2,-4)半径R
MC为定值R,R^2=(√6)^2+10=16
M:
(x-2)^2+(y-4)^2=16
或(x+2)^2+(y+4)^2=16
1)圆心C(t,2t)
C到直线距离D
D^2=R^2-(4√2/2)^2=2
D^2=(|t-2t|/√2)^2=2
t=2或t=-2
c(2,4)或c(-2,-4)
方程:
(x-2)^2+(y-4)^2=10或
(x+2)^2+(y+4)^2=10
2)
是圆心(2,4)(-2,-4)半径R
MC为定值R,R^2=(√6)^2+10=16
M:
(x-2)^2+(y-4)^2=16
或(x+2)^2+(y+4)^2=16