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angle between line and plane
Author:
johnmayhk
GeoGebra
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三位數除以一位數（二）
兩位數加法
四邊形的特性
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
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拋物線與直線相交弓形區域
畢氏數
圓內接四邊形的圓周角
随机三角形背景
祖冲之的期望：内棋与外棋
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Cube
Real Numbers
Kite
Geometry
Function Graph