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Round answer to the nearest foot. 6. A bird is flying at a height of 40 feet and spots a ledge that is 8 ft high on which to perch. If the top of the ledge is at a 22 angle of depression from the bird, how far must the bird fly before it can land? 7. Which of the following is the angle of depression in the figure?  8. A tree 10 meters high casts a 17.3 meter shadow. Find the angle of elevation of the sun. 9. If the side of the square is 3 feet, then find the acute angle of elevation.  10. Tom and Sam are on the opposite sides of a tower of 160 meters height. They measure the angle of elevation of the top of the tower as 40 and 55 respectively. Find the distance between Tom and Sam. 11. From the top of a spire of height 50 ft, the angles of depression of two cars on a straight road at the same level as that of the base of the spire and on the same side of it are 25 and 40. Calculate the distance between the two cars. 12. From the top of a tower of height hmeters the angle of depression of a red car is  and the angle of depression of a blue car which is on the opposite side of the tower is  . If the distance between the foot of the tower and the red car is ymeters, then find the height of the tower and the distance between the two cars. Assume that the points of location of the cars and the foot of the tower are collinear. [Given y= 115, = 55 and = 40.] 13. The angle of elevation of an unfinished tower from a point 120 m away from its base is 25. How much higher will the tower need to be <PQRSX 8 9 : ; ? 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