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From September 21 until March 21, the shortest shadow points north from the equator. From March 21 until September 21, the shortest shadow points south from the equator.
Well, no trees have a shadow if it is dark, or if they are shaded by a bigger tree. But a family tree may have no shadow.
Light travels in straight lines and therefore some will hit the tree. Where this happens a shadow (absence of light) is created behind the tree.
Let the height of the tree be x: x/10 = 5/4 x = 50/4 The tree is 12.5 feet
4.5 ft