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圓內接四邊形任務二：提示一
Author:
Stanley Mak
GeoGebra
New Resources
柱體建築師
四邉形 (四年級) 教師版
画直线等分三角形的面积
異分母分數減法
三位數除以一位數（一）
Discover Resources
固定周界的長方形面積變化
Comparing fractions using number lines and rectangles
Equal arcs, equal angles, equal chords
雙曲線諸元
竞猜游戏：说出图中角的大小
Discover Topics
Cosine
Incircle or Inscribed Circle
Equilateral Triangles
Dilation
Trapezoid