pencil compass

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  • 圆规
    1. Use your compass to bisect an angle.
      用圆规把一个角二等分。
    2. Trisecting an arbitrary angle with a compass and straightedge was one of the famous ancient Greeks unsolved construction problems.
      用直尺和圆规三等分一个任意的角是古希腊著名的构造问题之一。

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