27. The distance between two parallel lines can be defined as the length of any line segment drawn perpendicularly between them. In the diagram shown, m n and AB Im. (a) Explain why AB must be perpendicular to line n as well. S n (b) If CD was drawn in a different location such that C lies on line m and D lies on n and CD was perpendicular to both, explain why CD must be the same length as AB . (Hint: draw a possible CD)