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Question 1039195: I am working with Triangle Exterior Angle Theorems and was confused by this problem. I also need to prove it in a two column proof form. Can you help me?
The measure of each exterior angle of a triangle equals the sum of the measures of its two remote interior angles: m<1 = m<2 + m<3
Thank you.
Answer by ikleyn(52903)   (Show Source):
You can put this solution on YOUR website! .
For line-by-line proof see the lesson Sum of the interior angles of a triangle in this site.
It is not a two-column proof, although (!).
But I advise you to learn line-by-line proof first, before writing the two-column.
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Euclid wrote everything line-by-line.
Thousand years people learned and wrote Math line-by-line and knew everything.
In scientific math journals/magazines professionals write line-by-line only.
Nobody writes in two-columns.
In my generation people learned and wrote Math line-by-line and knew everything.
Now students are touched to write in two-columns and know nothing.
It is how contemporary USA math education system works now.
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