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圓錐截痕
Author:
洪宜慧
GeoGebra
New Resources
球體建築師
柱體建築師
畫出對稱圖形
判斷球體
兩位數除以一位數（二）
Discover Resources
三角形重心(相關說明)
分數減法
dse13
sine graph (reduce to 1/2 and then translate leftward by 15 degree)
Cuboid 長方體
Discover Topics
Probability
Sphere
Mathematics
Cone
Line Segment