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the angle of elevation to the tower is 30 degree and then moved towards the tower of a distance 20m.now thw angle of elevation...Asked by Anonymous
6.The angle of elevation to the tower is 30(degree) and then moved towards the tower of a distance 20m. Now the angle of elevation is 60(degree). What is the height of the tower?
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Answered by
Reiny
Make a sketch
Label the top of the tower as P and its base Q
Label the first position of observer as A, his second position as B
Join the straight line ABQ
In triangle ABP, angle A = 30
angle ABP = 120
thus angle APB = 30, making AB = BP
In triangle PBQ
sin60 = PQ/30
PQ = 30sin60 = ...
Label the top of the tower as P and its base Q
Label the first position of observer as A, his second position as B
Join the straight line ABQ
In triangle ABP, angle A = 30
angle ABP = 120
thus angle APB = 30, making AB = BP
In triangle PBQ
sin60 = PQ/30
PQ = 30sin60 = ...
Answered by
arch
17.32m
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