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三垂線定理
Author:
詠甯
GeoGebra
New Resources
拼砌四邊形
異分母分數減法
畫出對稱圖形
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
Discover Resources
圓柱體表面面積
tessellation design
任何三角形內角和180度(五上數翰４－２)
均分除法（分數÷整數）
球的内接三棱锥
Discover Topics
General Quadrilateral
Limits
Subtraction
Function Graph
Conic Sections