Definition

1. Noun (Mathematics):
   • Trihedral: A geometric figure formed by three planes that intersect each other and are bounded by their lines of intersection. It is the three-dimensional analogue of an angle, essentially a solid angle.

Usage Examples

• Noun:
  • Trong hình học không gian, một tam diện có ba mặt và ba cạnh. (In solid geometry, a trihedral has three faces and three edges.)
  • Góc tam diện là một khái niệm quan trọng. (The trihedral angle is an important concept.)

Advanced Usage

• "Góc tam diện": trihedral angle. This specifies the angle formed by the three planes meeting at a point.
  • Họ tính toán giá trị của góc tam diện. (They calculated the value of the trihedral angle.)

Variants and Related Words

• Lưỡng diện (n): dihedral, a figure formed by two intersecting planes.
  • Góc lưỡng diện được nghiên cứu trước. (The dihedral angle was studied earlier.)

Synonyms

• Trihedral: The direct English equivalent in geometry.
• Solid angle: A more general term that can be formed by multiple planes, with a trihedral being a specific case.

Notes

• This is a specialized term used almost exclusively in the field of geometry. It is not commonly used in everyday conversation.