maths chapter 6 class IX NECERT ex6.1 5
A vertical tower stands on a horizontal plane and is surmounted by a vertical flagstaff of height h. At a point on the plane, the angles of elevation of the bottom and the top of the flagstaff are alpha and beta respectively. Prove that the height of the tower is h(tan+tan
) / tan
-tan
.
A solicitor's firm employs typists on hourly piece-rate basis for their daily work. there are five typists qnd their chargs and speed are different