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प्रश्न
How can an ellipse be drawn using pins and thread?
विकल्प
By tying thread around one pin only
By keeping thread loose
By keeping thread taut around two pins and moving a pencil
By drawing circles around pins
MCQ
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उत्तर
By keeping thread taut around two pins and moving a pencil
Explanation:
The thread loop keeps constant sum of distances to two pins (foci).
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