400-1816-180
本題由chris提供
For the cube shown above, what is
A. 30
B. 45
C. 60
D. 75
E. 90
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答案：
C
問(wèn)的是角
因?yàn)槭钦襟w，所以PQ=RQ=PR，三角形PQR為正三角形
所以角PQR=60度
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