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30度直角三角形
Author:
郭勇
GeoGebra
New Resources
拼砌四邊形
球體建築師
兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
三位數除以一位數（二）
Discover Resources
三角形面積與內切圓半徑
Is this a prism 4
摩天輪
repetitive square
六角形(草稿)
Discover Topics
Natural Numbers
Differential Equation
Unit Circle
Similar Triangles
Calculus