Wikipedia:Articles for deletion/Cut-the-Knot
I don't see really see how cut-the-knot fails . The website has won several awards and in my perception well known and well regarded in the community (of math education/didactics) in particular for classic geometry. My personal perception aside you can find it referenced/mentioned in various math textbooks (easily verifiable via google books), that is that is textbooks by distinguished mathematician published with well known educational and/or academic publishers
— User:Kmhkmh, 04:45, 10 August 2017 (UTC)
Stance: keep
Cited policy: WP:WEBCRIT (Wikipedia:Notability)