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dihedral angle MATH

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Two planes in space are said to be perpendicular if the dihedral angle at which they meet is a right angle (90 degrees). en.wikipedia.org

The dihedral angle of two planes can be seen by looking at the planes edge on, i.e., along their line of intersection. en.wikipedia.org

The first nine aircraft were built with constant dihedral angle. en.wikipedia.org

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