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This puzzle is not original but if OK I’m asking how many straight line cuts need to be made to a rectangle (not-folded) so that it can be then made into the shape below. No gluing is needed. enter image description here

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1 Answer 1

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You can do it in

3

Just

Make two parallel cuts on one side, and then a third cut on the opposite side. Then flip half of the paper.

Please excuse my bad drawing:

The dark lines are where the cuts would be (imagine they are straight) and the dotted blue line is where you would "flip" half of the paper, once you had made the cuts.

slightly better than the last one

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  • $\begingroup$ That's exactly it! $\endgroup$
    – Tom
    Apr 5, 2016 at 14:01
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    $\begingroup$ Actually, if you make a fold first, you can make the two parallel lines from the same side in a single cut. (so 2 cuts needed). Im wondering if clever folding would let you do it in one cut... (NVM - just noticed OP mentioned 'not folded' in question) $\endgroup$ Apr 5, 2016 at 14:22
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    $\begingroup$ We need an animated illustration! $\endgroup$ Apr 5, 2016 at 14:35
  • $\begingroup$ @Raystafarian Sounds like you just volunteered to make me one. $\endgroup$ Apr 5, 2016 at 14:35
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    $\begingroup$ You might've meant a picture halfway between the two versions you put up, question_asker. Here's a re-edited version, i.sstatic.net/TfQIp.png $\endgroup$
    – humn
    Apr 5, 2016 at 16:23

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