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圆与扇形面积（三）
Author:
math Ku
Topic:
Area
,
Circle
GeoGebra
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柱體建築師
兩組對邊相等的四邊形
画直线等分三角形的面积
判斷球體
異分母分數減法
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多項式
No. 7 of Exercise 12C
Copy of 閱讀鐘面及數字鐘（時和分）
Shen Kuo Frustum
test
向量與坐標
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Subtraction
Normal Distribution
Cosine
Sphere
Expected Value