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與三個半圓相切之圓家封閉面積
Author:
張道民
GeoGebra
New Resources
找出對稱軸
錐體建築師
柱體建築師
異分母分數減法
三位數除以一位數（一）
Discover Resources
拋物線
斯霍滕(Schooten)定理(與角平分線定理等價)
Number of solutions of two straight lines
圖解多項式的乘積
内外弦图
Discover Topics
Statistics
Scatter Plot
Inequalities
Multiplication
Boxplot