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World's Second-Hardest Easy Geometry Problem
Author:
Terry Chau
Topic:
Geometry
幾何老題2
GeoGebra
New Resources
三位數除以一位數（二）
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
算柱 (兩位數)
Discover Resources
垂心即內心
Tracing the Cosine Graph
柱體體積(四邊形)
畢氏定理
中國火柴遊戲一的副本
Discover Topics
Mode
Set Theory
Power Functions
Integers
Correlation