Question

一道高一数学题（关于圆和直线方程）,在线等!

Answer 1

1

kAB=1/3,KAD=-3

y-1=-3(x+1)

3x+y+2=0

2

LianLi 3x+y+2=0,x-3y-6=0,

x=0,y=-2

r^2=(2-0)^2+(0+2)^2=8

(x-2)^2+y^2=8