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周界和面積
Author:
Tse Sir
GeoGebra
New Resources
國旗 (作圖步驟直接餵給 Claude)
Nested spiral octagon
算柱 (兩位數)
找出對稱軸
中華民國國旗 (Codex╱2026.10.06)
Discover Resources
畢氏定理動態證明(歐基里得，平形四邊形等面積，應用polyline)
HKMO 2008 Question 3 Demonstration (Geometric Construction)
加法
圆柱沿着螺线展开成平行四边形
y=Asin(wx+f)图像变换
Discover Topics
Frequency Distribution
Cosine
Coordinates
Percentages
Natural Numbers