Because of the position of the Sun during different times of the day
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An answer to this question requires information about the position of the sun when the shadow is measured. Shadows always appear shorter when the sun is high in the sky
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