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单词 DihedralAngle
释义

dihedral angle


Two distinct half-planes, emanating from a same line l, the space (3) into two regions called dihedral anglesMathworldPlanetmath.  The line l is the edge of the dihedral angle and the bounding half-planes are its sides.

The angle, which the sides of a dihedral planes separate from a normal planeMathworldPlanetmathPlanetmath of the edge, is the normal sectionMathworldPlanetmath of the dihedral angle.  Apparently, all normal sections are equal.  According to the of the normal section, the dihedral angle may be called acute, right, obtuse, straight, skew (http://planetmath.org/ConvexAngle), convex and concave.  Unlike the angle between two planes, a dihedral angle may be over 90 .

If two planes intersect each other and if one of the four dihedral angles formed is right, then also the others are right.  Then we say that the planes are perpendicularPlanetmathPlanetmath to each other.

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更新时间:2025/5/4 1:25:07