Question

已知A的坐标系为(-3,-4),B的坐标为(5,0),求原点O到AB的距离

Answer 1

直线过(5,0) ∴设y=k(x-5)

k=(0-(-4))/(5-(-3))=1/2

y=(1/2)(x-5)

2y-x+5=0

d=|2*0-0+5|/√(2^2+1^2)=√5