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正四面體交角
Author:
lamanleung
GeoGebra
New Resources
第八周作业
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
球体的体积推导
拼砌四邊形
Discover Resources
海龍公式與內切圓半徑
面積換算公式
光的折射（光线自右下向左上）
Internal tangent
文繞圖2
Discover Topics
Logarithm
Addition
Equilateral Triangles
Diagrams
Vectors 2D (Two-Dimensional)