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Is it a condition for //gram?
Author:
johnmayhk
GeoGebra
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四邉形 (四年級) 教師版
兩組對邊相等的四邊形
拼砌四邊形
sanjiaohanshu
找出對稱軸
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corry v2
題6
鉛筆的長度
Rotation
reflectional symmetry_2
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Right Triangles
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