在空间几何图形中,二面角是常见的。二面角的大小可以由它的平面角来度量。以二面角的棱上任意一点为端点,在两个面上分别引垂直于棱的两条射线,这两条射线所成的角就叫做二面角的平面角,它的大小就是二面角的大小。如果以二 Dihedral angles are common in spatial geometry. The dihedral size can be measured by its planar angle. Take any point on the edge of the dihedral angle as the end point. Two rays perpendicular to the edge are respectively drawn on the two faces. The angle formed by these two rays is called the planar angle of the dihedral angle, and its size is two sides. The size of the corner. If two