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johnmayhk
GeoGebra
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拼砌四邊形
美國國旗 (Codex 版)
兩組對邊相等的四邊形
判斷球體
國旗 (Claude 版)
Discover Resources
尤拉線80530陳昱任螢橋國中
color
因數（1至24）
橢圓2--四圓心近似法
Tangent of circle
Discover Topics
Straight Lines
Polygons
Cosine
Similar Triangles
Special Points