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學習單：三角形任一外角與內角關係
Author:
Tsai, Dung Jung
,
Tim Brzezinski
GeoGebra
New Resources
判斷球體
拼砌四邊形
兩組對邊相等和有直角的四邊形
四邊形的特性
兩位數除以一位數（一）
Discover Resources
判斷柱體 9
三角函數
堆垛六顆鬼東西
兩條數線比較(雙單位)
救生員區域
Discover Topics
Hypothesis Testing
Rational Numbers
Cosine
Differential Equation
Cone