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5-s-01-能透過操作，理解三角形三內角和為180度
Author:
chuck.ncyu
GeoGebra
New Resources
球體建築師
兩位數加法
柱體建築師
算柱 (兩位數)
三位數除以一位數（一）
Discover Resources
弧度制的意义
四位數
求三棱锥体积
基础知识
翰林數學_1下_CH2-1_直角坐標平面的認識
Discover Topics
Differential Calculus
Sine
Planes
Algebra
Similar Triangles