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invariance interval
Author:
nicolasqin
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第八周作业
拼砌四邊形
球體建築師
Earth with coastline
Nested spiral octagon
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y=mx+k
Quiz on Projection of a Line Segment on a Plane 投影：測驗
證平行四邊形 (對邊相等)
中空柱體
gltzk 角錐的兩種展開圖
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Random Variables
Unit Circle
Prism
Exponential Functions
Translation