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平行四邊形的高
Author:
whtong
GeoGebra
New Resources
拼砌四邊形
兩位數加法
球体的体积推导（优化版）
球體建築師
畫出對稱圖形
Discover Resources
做出一平面方程式通過A(6,0,0),B(0,6,0),C(0,0,3)的平面方程式
分解三棱柱
三角網狀圖
PIAY
全等三角形
Discover Topics
Curve Sketching
Bar Chart or Bar Graph
Root
Line Segment
Ellipse