From an aeroplane vertically above a straight line in a horizontal plane, the angles of depression of two consecutive kilometre stones on the opposite sides of the aeroplane are found to be alpha and beta. Then the height of the aeroplane[in km] is

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From an aeroplane vertically above a straight horizontal road, the angles of depression of two stones on opposite sides of the aeroplane are observed to be $α$ and $β$ . The distance between the stones is 1m.Then the height in meters of the aeroplane above the road is

Q. From an aeroplane vertically above a straight horizontal road, the angles of depression of two consecutive mile stones on opposite sides of the aeroplane are observed to be α and β. Show that the height in miles of aeroplane above the road is given by

\frac{\tan α \tan β}{\tan α + \tan β}

Q. From an aeroplane vertically above a straight horizontal road, the angles of depression of two consecutive mile stones on opposite sides of the aeroplane are observed to be

α

and

β

. Show that the height in miles of aeroplane above the road is given by

\frac{tan α tan β}{tan α + tan β}

From an aeroplane vertically above a horizontal road, the angles of depression of two friends standing on either side of the aeroplane are observed to be $α & β$ . The distance between the two friends is 1 m. The height (in metres) of the aeroplane from the ground is

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