Math is the study of abstractions. Math allows us to isolate one or a few features such as the number,
shape or direction of some kind of object. Then we can study what can be learned about the behavior
of those features while ignoring everything else about the object.
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I'm not sure what what your asking exactly, but U in math usually means "unit".
Exactly 3 times
An angle whose measure is exactly 180° - a straight line
That depends what exactly you want to convert. There are hundreds of conversion charts, for different purposes.
The last major kind of angle is the straight angle. A straight angle is an angle that measures exactly 180 degrees.