Discussion
The latus rectum of a conic is the chord through the focus drawn
Answer: B
Correct answer: perpendicular to the axis
The latus rectum is the focal chord at right angles to the axis, and its length is a natural measure of how open the curve is. For a parabola it is four times the distance from vertex to focus, which is the quickest way of setting out the width of the curve once the focus is fixed.
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