Shadow of an Pole
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“A pole is leaning against a wall A, against which it casts part of its shadow, and the remainder upon another wall B, at right angles with A. Let D be the source of light.” (Britannica, 1891)
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General Geometric IllustrationsSource
Benson John Lossing, ed. The New Popular Educator (London, England: Cassell & Company Limited, 1891)
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