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Comment by saagarjha

9 hours ago

I'm a fan of tearing paper along a crease rather than cutting it for this reason, since the tear is straight and using scissors will invariably be all over the place.

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saagarjha

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srean  9 hours ago

Yup and if you need a right angle, combine it with this

https://news.ycombinator.com/item?id=48538771

by roelschroeven.

I often wondered how to ensure that the corners of a sheet of paper make a right angle. You need that to form a square sheet, otherwise the standard trick of folding along the diagonal gives a rhombus, not a square.