Dihedral Angle Definition

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

Imagine two flat surfaces meeting along a common line. The measurement representing how much one plane is tilted relative to the other is the dihedral angle. This is a fundamental concept in solid geometry.

Evaluating the options:

• Polar angle relates to coordinate systems.
• Offset angle is not a standard geometric term for this context.
• Spline angle is related to curves and computer graphics.
• Dihedral angle is the correct geometric term for the angle between two planes.

Therefore, the correct term is 'dihedral'.