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Length of a shadow of a vertical tower on level ground increases by 10 m when altitude of sun changes from 45 to 30. Height?
The angle of elevation of the top of a tower from a point A due south is 30° and from B due east is 45°. If AB = 100 m, find height.
From top of building, depression of top and bottom of pole are 30 and 45. If pole is 10 m, building is:
A ladder leans against a wall at 60. If the foot is pulled 2 m, it makes 30. Ladder length?
Two people are on opposite sides of a tower 100 m high. Elevation is 30 and 60. Distance between them?
From a point on the ground, the angle of elevation of a jet plane is 60°. After a flight of 15 seconds, it becomes 30°. If plane flies at 1500√3 m, find speed.
The angle of elevation of the top of a tower from a point is α. On moving distance 'a' towards it, it is 45 and 'b' more, it is 90-α. Height?
An observer finds elevation of a hill top as 30. Moving 1 km towards it, it is 45. Hill height?
A balloon is at height 'h'. Angle of elevation from ground is α. It moves horizontally distance 'd' and elevation is β. Then d is:
Which of the following is equivalent to (1/sec θ)?