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angle sum of polygon
Author:
Felix Yip Wing Chung
GeoGebra
New Resources
多邊形的面積
祖冲之的期望：内棋与外棋
兩位數除以一位數（二）
三位數除以一位數（二）
平行線的斜率
Discover Resources
分解三棱柱
Ladder on Wall
四角柱體（長方體）的截面
鉛筆畫圓
三角形全等的直观图(可重合).许兴华数学
Discover Topics
Polygons
Histogram
Matrices
Addition
Line Segment