This paper provides a new construction method used when the horizontal projection of the plane Angle is equal to its space Angle.
本文提出平面角的水平投影与其空间角相等时新的作图方法。
This paper provides a new construction method used when the horizontal projection of the plane Angle is equal to its space Angle.
本文提出平面角的水平投影与其空间角相等时新的作图方法。
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