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p.8.18
Author:
Angela Lee
GeoGebra
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Earth with coastline
拼砌四邊形
畫出對稱圖形
sanjiaohanshu
Nested spiral octagon
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黃金螺線80235康瀚螢橋國中
緯度、日照、影子長。
IMO2015D
图中的三角形面积何时最小？（许兴华数学）
Sec1302 Example0203
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Linear Equations
Kite
Parallelogram
Rotation
Coordinates