Question 1046535

The latus rectum  runs parallel to the directrix and passes through the focus. Its length:

    In a {{{parabola}}}, is four times the focal length or {{{4p}}}. 


{{{p }}}= distance between the vertex and focus

Then
{{{2p}}} = distance between directrix and focus

{{{2L}}} = latus rectum

{{{2L = 4p}}}