this post was submitted on 11 Dec 2023
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Science Memes

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submitted 11 months ago by [email protected] to c/[email protected]
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[–] [email protected] 5 points 11 months ago* (last edited 11 months ago)

picture a square that is n times n, grid size 1. cut it diagonaly, you have n²/2, but that leaves out the bunch of triangles that are 1/2 each. how many of these triangles are there? n.

so we are left with n²/2 + n/2.

which is (n² + n)/2.

which is n(n + 1)/2.

edit.: maybe using an irl example like counting steps on a staircase and their area could help ilustrate it better, idk.