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共垂心
Author:
Altmann Cho
GeoGebra
New Resources
兩位數加法
兩位數除以一位數（一）
直角坐標平面上的旋轉變換
錐體建築師
算柱 (兩位數)
Discover Resources
構成三角形的邊長條件
三角形外心-性質說明
畢氏定理動態證明(歐基里得，平形四邊形等面積，應用polyline)
實作作業2
S2 Angles Related to Rectilinear Figures
Discover Topics
Pie Chart or Circle Chart
Polynomial Functions
Surface
Arithmetic Operations
Ratios