A/an ______ angle is the angle between two planes.

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RRB ALP Electrician 22 Jan 2019 Official Paper (Shift 1)
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  1. spline
  2. offset
  3. polar
  4. dihedral

Answer (Detailed Solution Below)

Option 4 : dihedral
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The correct answer is dihedral.

Key Points

  • ​The angle formed by two intersecting planes or half-planes is known as a dihedral angle.
  • It is the clockwise angle between half-planes in chemistry that passes across two sets of three atoms that share two atoms.
  • It is described in solid geometry as the union of a line and two half-planes that share this line's edge.

Additional Information

  • Spline:
    • The pitch diameter's angle with the involute curve and a tangent point on the base diameter make up a spline's pressure angle.
  • Offset:
    • It refers to striking a balance between two forces so that there is little variation between them.
  • Polar:
    • It is the counterclockwise angle from the x-axis at which a point in the negetive plane lies.  
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