Timeline for Proofs without words
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
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| Nov 9, 2020 at 8:23 | comment | added | RavenclawPrefect | @Jonah: Consider a circle moving rightwards, starting at the left corner of the football. If we put a dot on the bottom of this circle moving clockwise at the same speed as the circle, we can think of the dot as painted on the circle, and the circle as rolling on the bottom line. But if the dot instead moves counterclockwise, we can imagine the dot on a wheel rolling on the top line. This produces the cycloids in the diagram. But for a fixed position of the circle, the dots will be at the same altitude, and so their distance will be the width of the circle at that altitude. | |
| Sep 24, 2017 at 7:02 | comment | added | Jonah | How do you know each of the red bars of the football shape has exactly the width as the corresponding chord on the circle at the same height? | |
| S Oct 7, 2014 at 19:29 | history | answered | Thierry de la Rue | CC BY-SA 3.0 | |
| S Oct 7, 2014 at 19:29 | history | made wiki | Post Made Community Wiki by Thierry de la Rue |