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justin sin
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Ricrr Err
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GeoGebra
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New Resources
找出對稱軸
算柱 (兩位數)
畫出對稱圖形
三位數除以一位數（二）
兩組對邊相等的四邊形
Discover Resources
行列式計算平行四邊形面積
角平分線性質
cycloid
shuangquxian
圓周_半圓內的半圓
Discover Topics
Curve Sketching
Fractal Geometry
Ratios
Cone
Rational Numbers