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From a point on the ground, the angle of elevation of the top of a tower is observed to be 60 °   From a point 40 m   vertically above the first point of observation, the angle of elevation of the top of the tower is 30 °  ,then the height of the tower and its horizontal distance from the point of observation is

easy
a
20 3  m  , 30m
b
20 3  m  , 40m
c
20 3  m  , 50m
d
20 3  m  , 60 m 


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