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定理介紹：切線與半徑 | Tangent and Radius
Author:
Ricky LI
,
chisunch1
GeoGebra
New Resources
四邊形的特性
sanjiaohanshu
伊朗國旗 (Codex╱2026.10.07)
三半圓間的相切圓(Codex╱2026.10.07)
Earth with coastline
Discover Resources
DSE Circle-ACT01C Distance between Chords and Centre of a Circle
橢圓的定義（by Jutor）
数学
正三角形
Perimeter
Discover Topics
Terms
Pythagoras or Pythagorean Theorem
Rational Numbers
Square
Planes