Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. p ⁢ q ¯ is parallel to r ⁢ s ¯ . p ⁢ r ¯ and q ⁢ s ¯ are perpendicular to p ⁢ q ¯ and r ⁢ s ¯ . the ratio of the lengths of p ⁢ r ¯ and q ⁢ s ¯ is : .