phương khuy

Phương khuy của một elip là một đường tròn.

Definition

1. Noun (Mathematics):
   • Orthoptic: A geometric concept, specifically the locus of points from which two given curves (often conic sections like ellipses or hyperbolas) are seen at a right angle. It is the set of points where the tangents to the curves are perpendicular.

Usage Examples

• Noun:
  • Phương khuy của một elip là một đường tròn. (The orthoptic of an ellipse is a circle.)
  • Bài toán yêu cầu tìm phương khuy của hyperbol. (The problem requires finding the orthoptic of the hyperbola.)

Advanced Usage

• The term is highly specialized and used almost exclusively in advanced geometry. It is not used in everyday language.

Variants and Related Words

• Đường phương khuy (n): orthoptic curve, orthoptic locus.
  • Đường phương khuy được nghiên cứu trong hình học giải tích. (The orthoptic curve is studied in analytic geometry.)

Synonyms

• Orthoptic curve: The set of points from which tangents to a given curve are perpendicular.
• Orthoptic locus: Another term for the same geometric set.

Notes

• Word Origin: This is a Sino-Vietnamese mathematical term ("phương" meaning direction/method, "khuy" meaning deficient/lacking, here used in a specialized technical sense).
• Usage Context: This word is exclusively used in academic, mathematical, or geometric texts and discussions. It is not a common vocabulary word.