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固定面積的圖形周界變化
Author:
phcheng
,
GeoGebra Institute of Hong Kong
GeoGebra
New Resources
畫出對稱圖形
直角坐標平面上的旋轉變換
拼砌四邊形
異分母分數減法
兩位數除以一位數（一）
Discover Resources
手表内部秒针结构示意
test05繪本用
無意義
中國火柴遊戲二
拋物線與圓的最短距離
Discover Topics
Quadratic Functions
Polygons
Expected Value
Parabola
Pythagoras or Pythagorean Theorem