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證平行四邊形 (對邊相等)
Author:
W.L. Wong, Albert
GeoGebra
New Resources
近似值：有效數字
兩位數除以一位數（一）
拼砌四邊形
三位數除以一位數（一）
判斷球體
Discover Resources
normal vector
P2分物
圓與三角形中點的軌跡
假的龍珠
动圆与两圆外切与内切(2)
Discover Topics
Expected Value
Median Value
Natural Numbers
Pythagoras or Pythagorean Theorem
Linear Programming or Linear Optimization