From an aeroplane vertically over a straight horizontal road, the angles of depression of two consecutive kilometre-stones on the opposite sides of the aeroplane are observed to be a &
b. the height of the aeroplane above the road is
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consider the figure,
h/x=tan a
h/(1-x) = tan b
solving for h
h = 1/(cota+cotb)
h/x=tan a
h/(1-x) = tan b
solving for h
h = 1/(cota+cotb)
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