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餘弦定理
Author:
yuchengda
GeoGebra
New Resources
柱體建築師
三位數除以一位數（二）
球体的体积推导
四邊形的特性
第八周作业
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Quiz on Partial Variation 部分變：測驗
弧度制的意义
三角形面積
畢氏定理 (勾股定理) <Pythagorean theorem>
中國火柴遊戲一的副本
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Intersection
Scalene Triangles
General Quadrilateral
Derivative
Step Functions