Two lines with slopes m1 and m2 are parallel when:

  1. m1 m2 = -1
  2. m1 + m2 = 0
  3. m1 m2 = 1
  4. m1 = m2
Answer

D) m1 = m2

Equal slopes give tantheta = 0, so theta = 0^circ. SLO M-09-B-10 · Knowledge

Mathematics MCQ · More Angle Between Lines MCQs · Practise