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A real life example for the absolute value function is a football field. Even though the center of the field is labeled zero, you wouldn't say you ran negative feet if you went backwards..
There are very few real life examples of nonagons. The only examples that I can think of are a few coins.
examples include keys and copying machine
roads
There are actually quite a few real life examples of a midpoint. The Equator is an example of a midpoint.