Q179. If the angle between the pair of lines represented by the equation ax2 + 2hxy + by2 = 0 is 90°, which of the following conditions is true?Mathematics — Analytic Geometry — Question 179 of 217A. a + b = 0B. a = -bC. a/h = -1D. Both A and B are truePractice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →