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Q.


A ladder 9m long reaches a point 9m below the top of a vertical flagstaff. From the foot of the ladder, the elevation of the flagstaff is 60 degree. What is the height of the flagstaff?

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a

9m

b

10.5m

c

13.5m

d

15m 

answer is C.

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Detailed Solution


Given that CD = AD = 9m
Question ImageHence, Option (3) is the correct answer.
 
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A ladder 9m long reaches a point 9m below the top of a vertical flagstaff. From the foot of the ladder, the elevation of the flagstaff is 60 degree. What is the height of the flagstaff?