71.In figure, what are the angles of depressions of the top and bottom of a pole from the top of a tower h m high.
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72.A balloon is connected to a meterological ground station by a cable length 215 m inclined at 60° to the horizontal determine the height of the baloon leave the ground. Assume that there is no slack in the cable.
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73.In figure, what are the angles of depression from the observing point O of the objects at P and?
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74.In figure, what are the angles of depression from the observing point O of the objects at A and B?
75.In figure, what are angles of depression from the observing positions O1 and O2 of the objects at A?
Solution not provided Ans. 45° and 60°
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76.In figure, what are the angles of depression from the observing point O of the objects at A and B?
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77.From a point m away from the foot of a tower, the angle of elevation of the top of the tower is 30°. Find the height of tow'er.
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78.In figure, what are the angles of depression from the observing point O of the objects at A and B?
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79.In figure, what are the angles of depression from the observing positions O1 and O2of the following at A?
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80.A circus artist is climbing a 20 m long rope, which is tightly stretched and teid from the top of a vertical pole to the ground? Find the height of the pole, if the angle made by the rope with the ground level is 30°.
Short Answer Type
m away from the foot of a tower, the angle of elevation of the top of the tower is 30°. Find the height of tow'er.
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