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面面夹角17
Author:
学个啥呀
GeoGebra
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兩組對邊相等的四邊形
三位數除以一位數（二）
找出對稱軸
兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
Discover Resources
幾何作業
Sum of Interior Angles of Polygons 多邊形內角和
my math book
相似三角形
正方形纸片剪出正三角形（顶点在边上）
Discover Topics
Cylinder
Linear Programming or Linear Optimization
Circle
Surface
Conditional Probability