In Exercise, solve the given problems.
To find the height of a flagpole, a person places a mirror at M, as shown in Fig. 2.140. The person's eyes at E are 160 cm above the ground at A. From physics, it is known that ∠AME = ∠BMF. If AM = 120 cm and MB = 4.5 m, find the height BF of the flagpole.
Fig. 2.140
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