Question

From an aeroplane vertically above a straight horizontal plane the angle of depression of two consecutive kilometre stones on the opposite side of the aeroplane are found to be alpha and beta so that the height of the aeroplane is 10 alpha into 10 beta by 10 alpha + 10 beta

Answer 1

hope this will help you✌✌

Answer 2

10 = tan

$\textbf{Answer is in Attachment !}$