Discussion
Two planes intersect along a line, and a section taken parallel to that line gives an angle that is
Answer: D
Correct answer: greater than the true dihedral angle
The true angle is measured in a plane perpendicular to the line of intersection. A section taken parallel to that line cuts both faces obliquely, and cutting a wedge at a slant always opens the angle out, so the measured value exceeds the true one. Only the perpendicular section gives the correct figure.
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