Using Pythagoras theorem,
H^2 = P^2 + B^2
h = 200
p = 2x
b = 6x
Solving,
(200)^2 = (2x)^2 + (6x)^2
40000 = 4x^2 + 36x^2
40000 = 40x^2
40000/40 = x^2
1000 = x^2
= x
x = 31.62 ft
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