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Surface Area of a Sphere (Mnemonic) 球體的表面面積（記憶法）
Author:
Alex CHIK
Topic:
Area
,
Sphere
,
Surface
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
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Curves
z`]]
JLA Copy of Eri Chan
JLA Copy of ANSHS_BascoAlyana
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fancy shell graphics
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Solids or 3D Shapes
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