The height of a tree, if it casts a shadow 15 m long on the level of ground, when the angle of elevation of the sun is 45°, is
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The height of a tree, if it casts a shadow 15 m long on the level of ground, when the angle of elevation of the sun is 45°, isusually and the UK as the sun is a or so that it will not only make it the same for a few years as it has to go
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