Discussion
A parabola whose vertex is 25 mm from its focus has a latus rectum of
Answer: B
Correct answer: 100 mm
The latus rectum of a parabola is four times the distance from the vertex to the focus: \[ 4 \times 25 = 100\ \mathrm{mm}. \] It is the width of the curve measured at the focus, and it gives a quick check on a construction - the curve should pass 50 mm either side of the axis level with the focus.
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