Discussion
For that same ellipse the distance between the two foci is
Answer: D
Correct answer: 80 mm
The foci lie at \( \pm c \) from the centre, so the distance between them is \[ 2c = 2 \times 40 = 80\ \mathrm{mm}. \] With the major axis 100 mm, the foci sit 10 mm inside each vertex, which is the measurement used to set them out on the drawing.
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