<PRE><B>Question 782974</B>
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The interior angle adjacent to &lt; 2 forms a linear pair with &lt; 2, hence it is supplementary.  But you know that this angle adjacent to &lt; 2 is equal in measure to &lt; 1 because opposite interior angles are congruent.  So you can say that 2 plus its adjacent = 180 by definition of linear pair, then 2 plus 1 = 180 by substitution.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
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My calculator said it, I believe it, that settles it
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