Theorem 3.12 Lines Perpendicular to a Transversal Theorem Am .n In a plane, if two lines are perpendicular to the same line, then they are parallel to each other. If mp and np, then m || n. Notes: Extra Practice Use the distance formula for #1-4 In Exercises 1-4, find the distance from point A to BC. 1. 3. (-3, 0) A -2 y C 2 (3,2) B -4 (-3,-4) D(-1,-2) y 4 B(-1, 3) D(0, 1) -4 4 x 2. (-3,-4) YC(1, 4) 2 4. Ay 4 2 D(3, 2) (4, 1) B 4 X A (1, 3) (3, 2) 2 4 x -4 -2 B(1, -2) A(-3,-3) C(1, 1) D(0, -4) 4 x