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Dirks Geodreieck 02
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Discover Resources
Functions
Standard Deviation (two data sets) 標準差（比較兩組數據）
Circle theorems
Reflection about two lines
Untitled
New Resources
Perp Bis Problem
Finding Sides of Right-Angled Triangles
NS1-02-P4a2-CYU3-RQ3 (Product Rule)
Post shadow, Sun behind
Post shadow, lamp in front
