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圓心至弦的垂線平分弦
Author:
Sam
GeoGebra
New Resources
斐波那契螺旋弧线（表格法）
双心四边形
正方形雪花图案
异形操场
第八周作业1
Discover Resources
正七邊形
以 Unit Circle 了解 Sine 的正/負
Quiz on Solving Right Triangles (Finding Side Lengths) 解直角三角形：測驗1（求邊長）
移動愛心
沪教版练习册7.4第4题
Discover Topics
Cuboid
Arithmetic Operations
Line Segment
Curve Sketching
Tangent Line or Tangent