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正四面体的外接球（补形法）
Author:
huicong wang
GeoGebra
New Resources
美國國旗 (Codex 版)
兩組對邊相等和有直角的四邊形
找出對稱軸
sanjiaohanshu
小数 的副本
Discover Resources
「分點」平行四邊形
救生員的職責
三角形外心
探索三角形外角定理
正四面體碎形
Discover Topics
Trigonometric Functions
Statistical Characteristics
Arithmetic
Normal Distribution
Tangent Function