Question

绕倾斜角为30度的直线

Answer 1

l的倾斜角为30˚,l1的倾斜角为30˚+ 30˚ = 60˚,l1斜率为tan60˚ = √3

AB的中垂线斜率为√3,AB的斜率为k = -1/√3 = (m - 1 - 2)/(1 - m)

(√3 - 1)m = 3√3 -1

m = (3√3 -1)/(√3 -1) = 5-2√3