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A taut 20 cm string is tied to two pins 12 cm apart and a pencil traces an ellipse. Its semi-minor axis is
A6 cm
B8 cm
C10 cm
D16 cm
Answer & Solution
Correct answer: B. 8 cm
The string length is the constant sum 2a = 20, so a = 10; with c = 6, b = √(100 - 36) = 8 cm.
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