2 2
Rationalised 2023-24
MATHEMATICAL MODELLING        199
Let
l = PC = QB
Now
tan α = AC
H
PC
h
−l
=
or
H = h + l tan α (1)
Step 3 Note that the values of the parameters h, l and α (using sextant) are known to
the observer and so (1) gives the solution of the problem Step 4 In case, if the foot of the tower is not  accessible, i