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  • 四邊形內多個四邊型旋轉

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  • 量角器

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  • 同心圓和線段-3(線段到最外圓有小圓)

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  • 同心圓和線段-2(最外圓大小固定)

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  • 同心圓和線段

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  • 國旗動畫

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  • 一點在圓上跑一點在三角形上跑兩點中點軌跡

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    jessice

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  • 與三個半圓相切的圓不規則區域著色

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  • 由線段與弧構成的封閉區域填色

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  • 與三個半圓相切的圓

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