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Feb 21, 2022 at 7:02 comment added KConrad @LSpice when I mentioned my misunderstanding to a few people earlier, a few of them acknowledged also thinking the term was frustrum. The other day I looked in several high school geometry textbooks in the hope that my error could be blamed on textbooks propagating it, but instead every single one used the correct word.
Feb 21, 2022 at 0:51 comment added LSpice I'm so glad I'm not the only one who's been going through life thinking the word was ‘frustrum’. I've even made mathematician/dad jokes in the spirit of yours about “it's hard to remember the word ‘frustrum’; you might find it frustrating.”
Feb 21, 2022 at 0:49 history edited LSpice CC BY-SA 4.0
Missing period
Feb 20, 2022 at 20:29 vote accept Joacim Andersson
Feb 20, 2022 at 20:13 history edited KConrad CC BY-SA 4.0
added 7 characters in body
Feb 20, 2022 at 20:07 history answered KConrad CC BY-SA 4.0