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圆扇形展开（解释面积公式）
Author:
朱亮
GeoGebra
New Resources
判斷球體
畫出對稱圖形
異分母分數減法
兩位數除以一位數（二）
柱體建築師
Discover Resources
Compare areas by cutting shapes Q3
四年級面積的量度
circle
繡曲線04
勘根定理
Discover Topics
Trapezium
Cosine
Rhombus
Fractal Geometry
Perimeter