Two buildings on a plane ground are 30 m apart. From the top of the smaller building, one sees the base of the other building at an angle of depression of 60∘ and its top at an elevation of 35∘. Find the height of the bigger building.
[Tan 60∘=1.7Tan 35∘=0.7]
Let CD & AB be the smaller and taller building respectively.
DE = AC = 30 m