MCQOPTIONS
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MCQOPTIONS
| 1. |
A spherical balloon whose radius is r, subtends an angle a at the eye of an observer on the ground, when the angel of elevation of its centre is B. The height of its centre is : |
| A. | r cosec a sinB |
| B. | r cosec a/2 sinB |
| C. | r cosec a/2 cos B |
| D. | r sin a sin B |
| Answer» C. r cosec a/2 cos B | |