File talk:Pi-unrolled.gif
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Wrong version
[編輯]
Why is the sucky, low-resolution copy here? — Xiong熊talk* 15:51, 27 September 2008 (UTC)
Innacurate
[編輯]
The circumference of a circle is 2(pi)r. The wheel completes one rotation but only covers (pi)radians, should it not complete 2(pi) radians, therefore rotating out to 6.28? Alternatively, if only half of the circumference was unrolled, this image would be accurate. — 以上未簽名的留言是由該使用者加入的： RWW2 (留言 • 貢獻) 21:08, 23 September 2021 (UTC)
- r = 0.5 --Achim (對話) 21:28, 23 September 2021 (UTC)
