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perimeter
Author:
wongwk
,
Tim Brzezinski
GeoGebra
New Resources
龙形曲线-分形龙
正方形雪花图案
探究三角形的全等條件
圓的切線方程
直線的斜率：水平變化 & 鉛垂變化
Discover Resources
題二
分段函數
幸運輪
QQ空间
test
Discover Topics
Arithmetic Operations
Area
Random Variables
Conic Sections
Root