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angles sum of a triangle 2
Author:
LAM YU SANG
GeoGebra
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多邊形的面積
圓的基本性質
正方形雪花图案
三角函数 的副本
龙形曲线-分形龙
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波的干涉 Wave Interference
Locus指令的練習
多邊形的伸縮
CIRCLE
給三角形, 求以三頂點為圓心, 作三個外切圓
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Tree Diagrams
Ratios
Linear Equations
Prism
Congruence