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quadrilaterals 4
Author:
iedc
GeoGebra
New Resources
拼砌四邊形
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
算柱 (兩位數)
兩位數加法
Discover Resources
Tractrix surface
向量分點公式
任何三角形內角和180度(五上數翰４－２)
正弦函数图象
球面截痕
Discover Topics
Symmetry
Arithmetic
Linear Functions
Dilation
Set Theory