(HW1 #1) |
(No difference)
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Latest revision as of 13:08, 2 September 2009
On the very first problem, is this one where we need to prove both parts? Or am I just reading it incorrectly?
If l and m are parallel, then each pair of exterior angles on the same side of the transversal adds up to 180 degrees. If at least one pair of exterior angles on the same side of the transversal adds up to 180 degrees, then l and m are parallel.