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不規則圖形的周界(intro)
Author:
WYC
GeoGebra
New Resources
算柱 (兩位數)
【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
球体的体积推导（优化版）
四邉形 (四年級) 教師版
Discover Resources
橢圓
Similar triangles in a triangle
Tangent to a curve at a point
雙曲線1 焦點法
少了一個質數One less prime number
Discover Topics
Algebra
Isosceles Triangles
Arithmetic Operations
Rotation
Circle