Question: The CN Tower in Toronto is 553 m high, and has an observation deck at the 335-m level. How far from the top of the

The CN Tower in Toronto is 553 m high, and has an observation deck at the 335-m level. How far from the top of the tower must a 553-m high helicopter be so that the angle subtended at the helicopter by the part of the tower above the deck equals the angle subtended at the helicopter below the deck? In Fig. 20.18 these are the angles α and β.

Fig. 20.18

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