A triangle has sides with slopes 1, -1 and undefined (vertical). Which angles does it have?

  1. 90^circ, 60^circ, 30^circ
  2. 90^circ, 45^circ, 45^circ
  3. 135^circ, 22.5^circ, 22.5^circ
  4. 60^circ, 60^circ, 60^circ
Answer

B) 90^circ, 45^circ, 45^circ

Slopes 1 and -1 are perpendicular; a vertical side makes 45^circ with each of them. SLO M-09-B-12 · Knowledge

Mathematics MCQ · More Angle Between Lines MCQs · Practise