a tree casts a shadow 4m long on ground when the angle of elevation of the sun is
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In a triangle with one angle being 90 degrees (which the tree makes with the ground) and the other being 45 degrees (the angle of elevation), the 3rd angle is bound to be 45 degrees (180 - 90 - 45 = 45). We also know that sides opposite to equal angles are equal. Hence, the height of the tree will also be 4m.
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