From a window A, 15m above the ground, the angle of elevation of the top Pof a tower is x , where tanx=5/3 and the angle of depression of the foot Q of the tower is y, where tan y =3. Find the height PQ of the tower in m.
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Answer:]• (Fig. 17.) On the opposite bank of a river
to t^at on which I stood, is a tower known to be 216
feet high ; with a pocket sextant I ascertained the angle
between a horizontal line drawn from my eye (supposed
to be 5 feet above the ground) and its top to be 4 7° 5 6';
required the distance across the river, from the place
where I stood, to the bottom of the tower.
Ans. 190-4 feet.
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