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perimeter of rectangle
Author:
chh127245
,
Carmel Schettino
perimeter of rectangle
GeoGebra
New Resources
四邊形的特性
拼砌四邊形
【案例】2013年安徽高考15题
異分母分數減法
球体的体积推导（优化版）
Discover Resources
Sequence指令練習(逐一套疊正方形)
拼貼
李樂雯_尋找PI的活動
area 面積4
奠基
Discover Topics
Normal Distribution
General Quadrilateral
Correlation
Mode
Symmetry