# <span lang="EN-US

Let BC = s; PC = t

Let height of the tower be AB = h.

ABC = θ and APC = 90° - θ

( the angle of elevation of the top of the tower from two points P and B are complementary)

In

In

Multiplying eq. 1 and eq. 2, we get

h2 = st

h = st

Hence the height of the tower is √st.

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