NDA 2018 Mathematics question
Not in JEE syllabus
A spherical balloon of radius r subtends an angle at the eye of an observer, while the angle of elevation of its centre is . What is the height of the centre of the balloon (neglecting the height of the observer)?
Answer: (A)
Solution
The tangents from the eye to the balloon make an angle , so the line from the eye to the centre makes with each tangent and the
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