Let's consider the height of the tower to be ′h′ m.
(i) Here, θ=450
tan450=(h−1.6)/20
1=(h−1.6)/20
h=21.6m
Thus, the height of the tower is 21.6m.
(ii) Here, θ=600
tan600=(h−1.6)/20
√3=(h−1.6)/20
h=20×√3+1.6=36.24m
Thus, the height of the tower is 36.24m.