Given
#d->"Distance of the point from the base of the lamp"#
#"post from which angle of elevation is measured"=50 ft#
#A->"Angle of elevation"=48^@#
#"Let "h->"Height of the lamp post"#
So #h/d=tan48^@#
OR #h=50xxtan48^@-># This equation will give the value of the height of lamp post.