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angles sum of a triangle 1
Author:
LAM YU SANG
GeoGebra
New Resources
球體建築師
【案例】2018年全国1卷理科12题
畫出對稱圖形
兩位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
Discover Resources
三角形3,4,5
六角柱(可側轉、上下轉)
三角形面積公式B2
GGB5
平面截正方体
Discover Topics
Inequalities
Circle
Perimeter
Planes
Linear Programming or Linear Optimization