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Exterior angle of triangle(三角形的外角)
Author:
chisunch1
GeoGebra
New Resources
兩組對邊相等的四邊形
異分母分數減法
拼砌四邊形
柱體建築師
画直线等分三角形的面积
Discover Resources
均分除法（分數÷整數）
平行四邊形
Sine Wave 3D
任意角的三角函数
内外弦图
Discover Topics
Orthocenter
Cosine
Binomial Distribution
Arithmetic Operations
Distributions