A balloon is moving up in air vertically above a point 
on the ground. When it is
at a height 
a girl standing at a distance d (point 
) from 
(see figure) sees it at an angle 
with respect to the vertical. When the balloon climbs up a further height 
it is seen at an angle 
with respect to the vertical if the girl moves further by a distance 
(point ). Then the height 
is (given 
)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
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