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。
Use your compass to bisect an angle. 用圆规把一个角二等分。
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。