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5 December, 15:47

When the sun's angle of elevation is 57 degrees, a building casts a shadow 21 m long. how high is the building?

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  1. 5 December, 17:17
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    Tan (57°) = opposite/adjacent = x/21 ⇒

    x = 21 * tan (57°) = 21 * 1.5399 ≈ 32.34 m
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