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20200417平面直角坐标系复习T14（2）
Author:
陈敦莹
GeoGebra
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圓的基本性質
直線的斜率：水平變化 & 鉛垂變化
平行線的判定
双心四边形
活动三：应用性质
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史坦納圓 (Steiner Circle)
Apollonius Problem 4 LLP Power 12
中一︰全等圖形（平移、旋轉、反射）
优秀资源
拉格朗日插值多項式
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Translation
Vectors
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Complex Numbers
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