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面积
Author:
fei liu
Topic:
Area
,
Triangles
GeoGebra
New Resources
拼砌四邊形
兩位數除以一位數（一）
兩組對邊相等的四邊形
三位數除以一位數（一）
異分母分數減法
Discover Resources
三角函數with sine, cosine圖形
動國旗
與三個半圓相切之圓的填滿
重疊法
Sunrays with different angles
Discover Topics
Secant Line or Secant
Quadrilaterals
Cone
Trapezoid
Fractions