The shadow of a tower standing on a level plane is found to be 100 m longer when sun’s alti- tude is 30° than when it is 60°. Find the height of the tower.
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When the sun's altitude is at 30∘, ∠ADB=30∘and the length of the shadow=DB. So the length of the shadow is 40m when the angle changes from 60∘ to 30∘. That is CD=40m.
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