Well, Some Bridges have right triangles in them if the are truss bridges. Also paper footballs are right triangles. Hope that helped a little.
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There are very few real life examples of nonagons. The only examples that I can think of are a few coins.
Any pythagorean triangle with unequal legs.
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.