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The angle between two planes is measured in a plane

  • A.parallel to the reference line
  • B.perpendicular to their line of intersection
  • C.parallel to their line of intersection
  • D.containing their line of intersection

Answer: B

Correct answer: perpendicular to their line of intersection

The dihedral angle must be measured in a plane cutting both faces at right angles to their common edge, since any other section cuts the faces obliquely and gives a larger angle. This is the same reason that an auxiliary view for a dihedral angle is taken with the line of intersection appearing as a point.

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