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jessice
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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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與三個半圓相切的圓不規則區域著色全
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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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