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三角形内角和演示
Author:
啊哦呃
改变三角形的形状，其内角和不变。
GeoGebra
New Resources
拼砌四邊形
畫出對稱圖形
第八周作业
兩位數除以一位數（一）
判斷球體
Discover Resources
巴拉拉能量3.0
沈暐珊 橢圓反射
DSE Circle-ACT01B Relationship between Centre and Chord
带电粒子在匀强磁场中的运动
test for fun的副本
Discover Topics
Mode
Piecewise Functions
Percentages
Tangent Line or Tangent
Triangles