How to lie using visual proofs

Three false proofs, and what lessons they teach.
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Here's a nice short video on the false pi = 4 proof
https://www.youtube.com/watch?v=6Qnfd5dRyf4

Time stamps:
0:00 - Fake sphere proof
1:39 - Fake pi = 4 proof
5:16 - Fake proof that all triangles are isosceles
9:54 - Sphere "proof" explanation
15:09 - pi = 4 "proof" explanation
16:57 - Triangle "proof" explanation and conclusion
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Видео How to lie using visual proofs канала 3Blue1Brown