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area and parameter of triangle
Author:
Lau Chin Ho
GeoGebra
New Resources
第八周作业3
直線的斜率：水平變化 & 鉛垂變化
正方形雪花图案
三角函数 的副本
斐波那契螺旋弧线（表格法）
Discover Resources
畢氏定理動態證明(歐基里得，平形四邊形等面積，應用polyline)
SIN伸縮平移
Error (誤差)
Graph of Sine
圓形重疊問題
Discover Topics
Limits
Addition
Angles
Means
Perimeter