Question

How to find Latus rectum of parabola?

Answer 1

The line segment through a focus of a conic section, perpendicular to the major axis, which has both endpoints on the curve.
The length of a parabola's latus rectum is 4a, where a is the distance from the focus to the vertex.

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