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slide9
Author:
tao sun
GeoGebra
New Resources
常见四边形是否是双心四边形
第八周作业
平行線的判定
斐波那契螺旋弧线（表格法-可动态调节）
龙形曲线-分形龙2
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telling the time
拋物線的幾何性質
螺旋正方形
拋物線的開口、對稱軸、頂點
动圆与两圆外切与内切(1)
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Trigonometry
Perimeter
Congruence
Pythagoras or Pythagorean Theorem
Surface