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Math Help - What is straight?

  1. #1
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    What is straight?

    I want to define straight using the definition of having 180 degrees, but how do you explain 180 degrees?

    Also what types of symmetry are considered line symmetry?
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  2. #2
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    Quote Originally Posted by loutja35 View Post
    I want to define straight using the definition of having 180 degrees, but how do you explain 180 degrees?
    Also what types of symmetry are considered line symmetry?
    First a comment. Many who have worked in axiomatic geometry do not like using ‘degrees’ as a measure of angles.

    An angle is the union of two rays with a common endpoint; as in <br />
\angle BAC = \overrightarrow {AB}  \cup \overrightarrow {AC}

    Now a straight angle would be the case in which C-A-B.
    A,~B,~\&~C are collinear and A is between B~\&~C.
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