Q51. Two lines l1: a1x + b1y + c1 = 0 and l2: a2x + b2y + c2 = 0 are perpendicular if:Mathematics — Analytic Geometry — Question 51 of 217A. a1b2 - b1a2 = 0B. a1/b2 = a2/b1C. a1a2 + b1b2 = 0D. a1a2 + b1b2 ≠ 0Practice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →