原来等边三角形可以有90度角


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3 则回应给 原来等边三角形可以有90度角

  1. Fangyuan说道:

    fantastic~

  2. joy说道:

    你整天鼓捣了了啥啊!!

  3. Di说道:

    FYI球面几何正弦定理sinA/sina=sinB/sinb=sinC/sinc

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