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综合（2）15.&摆线问题
Author:
Sylvie
GeoGebra
New Resources
正方形雪花图案
龙形曲线-分形龙2
平行線的判定
活动三：应用性质
第八周作业2
Discover Resources
數字鐘
Trapezoid1
螺線相似正N邊形
勝者即正義，可愛即正義～(可用Ctrl+滑鼠滾輪放大界面)
F2 cylinder (r vs TSA)
Discover Topics
Similar Triangles
Orthocenter
Curve Sketching
Derivative
Pythagoras or Pythagorean Theorem