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圆周长演示
Author:
黄旭
Topic:
Geometry
GeoGebra
New Resources
兩位數加法
異分母分數減法
兩位數除以一位數（二）
直角坐標平面上的旋轉變換
判斷球體
Discover Resources
史坦納圓 (Steiner Circle)
Parallelogram 02
內心
圓周角與圓心角之度數關係臆測（圓心在圓周角的外部）
拋物線有範圍限制的極值
Discover Topics
Parabola
Quadrilaterals
Inequalities
Random Variables
Calculus