Q143. If A(11, 7), B(-1, k), and C(5, -1) are the vertices of a triangle ΔABC and m∠ACB = 90°, what is the value of k?Mathematics — Analytic Geometry — Question 143 of 217A. -5B. -4/3C. 7/2D. 8/3Practice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →