Question

直线的倾斜角与斜率 (13 16:47:50)

Answer 1

圆心坐标就是AB中点坐标,即(3/2,5/2)

AB的长是:根号[(4+1)^2+(2-3)^2]=根号26

即半径是:根号26/2

那么圆方程是:(x-3/2)^2+(y-5/2)^2=26/4=13/2

令y=0,则有:(x-3/2)^2+25/4=13/2

(x-3/2)^2=1/4

x-3/2=1/2,或x-3/2=-1/2

x=2,x=1

即与X轴的交点坐标是(2,0),(1,0)