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Perimeter
Author:
Miss Tsui
,
Anthony OR 柯志明
GeoGebra
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兩組對邊相等的四邊形
算柱 (兩位數)
近似值：有效數字
Nested spiral octagon
找出對稱軸
Discover Resources
正十二面體
Rotational and reflectional symmetry of a regular polygon
圓周_心算題02
双动点求三角形最大面积演示
質數
Discover Topics
Rectangle
Conic Sections
Arithmetic Mean
Standard Deviation
Mode