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圓外切及內切
Author:
luke huang
GeoGebra
New Resources
兩組對邊相等的四邊形
異分母分數減法
拼砌四邊形
兩位數除以一位數（一）
三位數除以一位數（二）
Discover Resources
圓周角
平行線
Sierpinski 分形
與三個半圓相切的圓
賺賠：例1的副本
Discover Topics
Median Line
Sine
Distributions
Vectors 2D (Two-Dimensional)
Rotation