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象限
Author:
李春培
GeoGebra
New Resources
球體建築師
兩組對邊相等的四邊形
球体的体积推导（优化版）
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等和有直角的四邊形
Discover Resources
Angle in Alternate Segment 2
複合圖形(二)
三角柱算體積
Measuring Volume 4
Q2-3
Discover Topics
Cosine
Normal Distribution
Geometric Mean
Statistics
Curve Sketching