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angle between line and plane
Author:
johnmayhk
GeoGebra
New Resources
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
拼砌四邊形
兩位數除以一位數（一）
第八周作业
Discover Resources
閱讀鐘面及數字鐘（時和分）
挑战中考压轴题
椭圆的定义
切割任意四邊形再拼砌成矩形
艾薛爾Escher
Discover Topics
Coordinates
Addition
Circumcircle or Circumscribed Circle
Angles
Conditional Probability