cause they are important
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You don't!
Its simply as this. The only way you would use right triangles in real life if you would want to become a math teacher.
you doint
Boats use them to navigate.
Buoyancy is used for many life examples, submarines, swimmers would like to know about it, and the army would use it. Those are some life examples that of real life that buoyancy would be used! Hope this helps!