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正弦定理
Author:
yuchengda
GeoGebra
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柱體建築師
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
找出對稱軸
【案例】2018年全国1卷理科12题
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gyzpa 拋物面鏡的反射
多邊形外角和
微信公众号“sx880A8”第706期中非国旗（Central African Republic）
活动三：应用性质
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Parallelogram
Pythagoras or Pythagorean Theorem
Fractal Geometry
Straight Lines
Translation