数学英语what is the value of angle LMN L,M and N are midpoint of the sides of a skeleton cube,as shown .what is the value of angle LMN

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数学英语what is the value of angle LMN L,M and N are midpoint of the sides of a skeleton cube,as shown .what is the value of angle LMN

数学英语what is the value of angle LMN L,M and N are midpoint of the sides of a skeleton cube,as shown .what is the value of angle LMN
数学英语what is the value of angle LMN
L,M and N are midpoint of the sides of a skeleton cube,as shown .what is the value of angle LMN

数学英语what is the value of angle LMN L,M and N are midpoint of the sides of a skeleton cube,as shown .what is the value of angle LMN
三角形所在的截面是个正六边形.所以120度

这需要高中的知识啊

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