一根固定長度的桿子，兩端在座標軸上滑動。如果桿子上有個固定的點，則此固定點所掃出來的軌跡會是一個橢圓。
- Resource Type
-
Activity
- Tags
-
- Target Group (Age)
- 15 – 18
- Language
- Chinese Traditional / 繁體中文
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