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中文（繁體）：圖為一打開 60° 的扇形，O 為圓心，半徑為 r，若 P 為位在 AB 弧上的一點，並且作垂直線段到扇形的兩邊，長度分別為 a 與 b ，那麼如何利用 a 與 b 計算出 r ？ |
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| Source | Own work |
| Author | PegasusRoe |
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I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 09:17, 4 June 2008 | | 169 × 142 (4 KB) | PegasusRoe (talk | contribs) | {{Information |Description={{zh-hant|1=圖為一打開 60° 的扇形，O 為圓心，半徑為 r，若 P 為位在 AB 弧上的一點，並且作垂直線段到扇形的兩邊，長度分別為 a 與 b ，那麼如何利用 a 與 b 計算出 r ？}} |Sou |
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