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 = ...
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?
2 answers
17.32m