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20200406找点构成直角和等角
Author:
陈敦莹
GeoGebra
New Resources
兩組對邊相等的四邊形
畫出對稱圖形
拼砌四邊形
四邊形的特性
兩位數除以一位數（一）
Discover Resources
From:PTT 國小題目求面積
小遊戲
圓內接四邊形任務二：提示一
分數小數
箭頭引導法計算文字乘以文數字
Discover Topics
Rotation
Conditional Probability
Line Segment
Orthocenter
Derivative