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練習 - 逆時針旋轉（三角形）
Author:
Lau Sir
Topic:
Triangles
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
四邊形的特性
判斷球體
兩位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
Discover Resources
三角形的外心軌跡
三角形
餘弦定理修正項及風車證明
equations of circle 2
七年级数学平行线间的橡皮筋问题
Discover Topics
Piecewise Functions
Set Theory
Cylinder
Sequences and Series
Scalene Triangles