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angles sum of a triangle 1
Author:
LAM YU SANG
GeoGebra
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兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
球體建築師
【案例】2013年安徽高考15题
四邊形的特性
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proof SAS
小二、小三_時間（學生版）
眼球定理
sequence
几何体的副本
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Calculus
Plane Figures or Shapes
Hyperbola
Trapezium
Ratios