How many pairs of parallel edges, such as , and , or , and , does a cube have? Repeating parallel edges do not count toward the final answer.

AMC 8 2015 Problem 12

AMC8 2015 年第 12 题

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How many pairs of parallel edges, such as \overlineAB, and \overlineGH, or \overlineEH, and \overlineFG, does a cube have? Repeating parallel edges do not count toward the final answer.

̅̅̅̅和𝐺𝐻 ̅̅̅̅ ，或者𝐸𝐻 ̅̅̅̅ 和𝐹𝐺 ̅̅̅̅ ）？在一个正方体中有多少对平行的棱（例如𝐴𝐵

A.6
B.12
C.18
D.24
E.36

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解析 · Solution

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