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圆的面积展开的副本
Author:
LT14888061
,
qianqianhouhou
拖动n分圆，拖动展开展开圆，拖动拼图拼成长方形。
GeoGebra
通过上面操作请推导圆的面积公式。
New Resources
sanjiaohanshu
球體建築師
四邊形的特性
兩組對邊相等和有直角的四邊形
小数 的副本
Discover Resources
refraction law
小学数学
證平行四邊形 (對角線互相平分) (對邊 // 且相等)
Cactest
农大
Discover Topics
Set Theory
Percentages
Random Experiments
Cuboid
Pie Chart or Circle Chart