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The word latus rectum came from Latin, latus means 'side' or line and rectum means 'straight'.
The formula for the Latus rectum is simply
2L = 4a
with a stands for the distance of the focus from the vertex of the parabola.
Given a, you can simply solve for the length of the latus rectum by using this formula..
L = 2a
Its latus rectum is its diameter. Since there are infinitely many diameters, the question needs to be more specific.
The latus rectum of a parabola is a segment with endpoints on the parabola passing through the focus and parallel to the directrix.
Polyphagotarsonemus latus was created in 1904.