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椭圆的定义

Author:guomenglin

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拼砌四邊形
兩組對邊相等和有直角的四邊形
柱體建築師
四邊形的特性
畫出對稱圖形

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滑桿2-3
Angles in pyramid
勝者即正義，可愛即正義～(可用Ctrl+滑鼠滾輪放大界面)
半圓上的圓周角
Exploration task

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Triangles
Fractal Geometry
Quadrilaterals
Similarity Transformation or Similarity
Indefinite Integral

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