The pupils of 4D are expected to measure the old chimney of the cane factory.
But how can they work it out ????
« The answer lies in trigonometry » says Sherlock Holmes
[youtube]http://www.youtube.com/watch?v=b8FiS29Ruuo&playnext=1&list=PL6A41FDE700420139&feature=results_video[/youtube]
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