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.
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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
Measure the tree with the meter stick.
Use Pythagoras' theorem: 102+122 = 244 and the square root of this is about 15.62049935' which is the distance.