octaviendanica octaviendanica 16-06-2015 Mathematics contestada ←→ is parallel to CD←→. AC¯¯¯¯¯ and BD¯¯¯¯¯ are perpendicular to AB←→ and CD←→ . What is the relationship between AC¯¯¯¯¯ and BD¯¯¯¯¯ ?