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These? https://dj1hlxw0wr920.cloudfront.net/userfiles/wyzfiles/a8e33bf1-7711-43e8-a230-b78001292f7f.gif https://dj1hlxw0wr920.cloudfront.net/userfiles/wyzfiles/

These? https://dj1hlxw0wr920.cloudfront.net/userfiles/wyzfiles/a8e33bf1-7711-43e8-a230-b78001292f7f.gif https://dj1hlxw0wr920.cloudfront.net/userfiles/wyzfiles/a8e3... I had those in high school and I hardly see any problem with them. It's just writing the proof neatly organized into a table, with the reasons for each step given.

crispyambulance 11y ago
It looks "unpleasant" out of context, but it is important to note that the proof is accompanied by a diagram of the parallelogram and the students who write this proof have been exposed to the reasoning behind the steps. High school geometry introduces many students to the idea that math is a way of reasoning and this is _very_ different from the boring grind that they were used to.