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Two pins and a taut string trace an ellipse. What do the pins mark?
AThe two foci of the ellipse
BThe two vertices of the ellipse
CThe ends of the minor axis
DThe centre and one vertex
Answer & Solution
Correct answer: A. The two foci of the ellipse
The taut string keeps the sum of distances to both pins constant, which is the focal property, so the pins sit at the foci.
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