The horizontal chord through the focus (see picture in opening section) is called the latus rectum; one half of it is the semi-latus rectum. The latus rectum is parallel to the directrix. The semi-latus rectum is designated by the letter p displaystyle p Paraboloids are also observed in the https://parabolasdelabibliaparani58013.daneblogger.com/25283617/la-guía-definitiva-para-parabolas-de-la-biblia-para-niños