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二次函數（第四階段）
Author:
宋宥輯
GeoGebra
New Resources
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
判斷球體
直角坐標平面上的旋轉變換
美國國旗 (Codex 版)
Discover Resources
Quiz on Naming of Congruent & Similar Triangles 全等及相似三角形的命名：測驗
正弦公式(證明)
扇形弧長公式1
Addition and Subtraction of Directed Numbers (2)
圆面积的推导-开普勒法
Discover Topics
Solids or 3D Shapes
Logarithmic Functions
Reflection
Scalene Triangles
Ellipse