sir this is the question from the book -ML aggarwal( avichal publication) class 10th , chapter20 , heights and distances
this is a very important question and has been asked in previous year exams.
we have been given that From a point P on the ground,
the angle of elevation of the top of a 10 m tall building
and a helicopter hovering over the top of the building are 300 and 600 respectively.
Find the height of the helicopter above the ground.
question no 15 , heights and distances , ICSE board