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平行四邊形面積
Author:
郭虹伶
Discover Resources
立體錯覺樓梯(使用透視法會稍有差距)
厚會聚透鏡 Thick Convergent Lens
高斯符號(floor)
Volume of pyramid from a cube
未命名
New Resources
碎形三角形
perpendicular line 25-9-2018
謝爾冰司機-正方形
方形地毯
旋转2
