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圓外切四邊形（展示可推廣到凹多邊形）
Author:
Gideon Huang
Topic:
Geometry
GeoGebra
New Resources
斜率的值
三位數除以一位數（一）
空间中两直线的位置关系
垂直線的斜率
圓的切線方程
Discover Resources
proof AAS
Orthocentre
四塊面積
转动中的杠杆
勾股定理介绍及证明
Discover Topics
Vectors 2D (Two-Dimensional)
Mode
Set Theory
Arithmetic Mean
Distributions