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The latus rectum of an ellipse with semi-axes a and b has length

A2a²/b
B2b/a
C2b²/a
Db²/a
Answer & Solution
Correct answer: C. 2b²/a
Taking the focus at (c, 0), the ordinate on the ellipse is b²/a, so the full chord is 2b²/a.
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