Transcription: Finding the dihedral angle of two intersecting planes is an extension of the edge view procedure. In this kind of problem, you need to find the edge view of both the intersecting planes. Find the line which is the intersection of the two planes, that is the line which belongs to both planes. Create a view which gives the true length of this line. Create a view perpendicular to the true length line, which will give the edge view of both planes. Measure the dihedral angle between the two edge views.
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