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Question

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

This question was previously asked in
RRB ALP/Technician 2018 CBT 2 Electronics Mechanic Question Paper (23-Jan-2019) (Shift 1)
The correct answer is
dihedral

Dihedral Angle Between Planes

The angle formed between two intersecting planes is specifically called a dihedral angle.

Understanding Dihedral Angles

A dihedral angle represents the angle between two planes that share a common line (the line of intersection).

  • It is measured within a plane that is perpendicular to the line of intersection of the two original planes.
  • This concept is fundamental in geometry, particularly in solid geometry and crystallography.

Analyzing Other Options

The other options represent different concepts:

  • Offset Angle: Typically refers to a deviation or shift, not specifically an angle between planes.
  • Polar Angle: Used in polar coordinate systems to denote the angle from a reference direction.
  • Spline: Refers to a smooth curve defined by control points, primarily used in computer graphics and design, not directly related to the angle between planes.

Therefore, the correct term for the angle between two planes is a dihedral angle.

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