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Quiz on Centres of Triangles 三角形的中心：測驗
Author:
Alex CHIK
GeoGebra
gMath 互動數學教室
http://www.gmath.hk
New Resources
算柱 (兩位數)
Nested spiral octagon
Fibonacci Clock
長方體平面投影 (Codex版)
兩組對邊相等和有直角的四邊形
Discover Resources
根據百分率找數量（一）: 例2
Quiz on Scientific Notation 科學記數法：測驗
中華民國國旗
圆锥曲线1
三角形的重心
Discover Topics
Random Variables
Reflection
Tangent Line or Tangent
Bar Chart or Bar Graph
Multiplication