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挑戰題4：一角內一點之最小周長
Author:
Erix Chen
GeoGebra
New Resources
第八周作业
兩位數除以一位數（一）
畫出對稱圖形
三位數除以一位數（一）
四邊形的特性
Discover Resources
simson line
test
同側AP+BP最小值
pythLK
等腰三角形
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Rotation
Planes
Limits
Numbers
Root