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橢圓軌跡 (4)
Author:
羅驥韡 (Pegasus Roe)
軌跡：靠在座標軸上的桿子 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。
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