semi-circumference

A student draws a semi-circumference on the chalkboard.

Definition

1. Noun:
   • Half the circumference: "semi-circumference" refers to half the distance around the perimeter of a circle or a curved shape. It is the measure of exactly one-half of the full circumference.

Usage Examples

• Noun:
  • The semi-circumference of the circle was calculated to be 15.7 centimeters. (Half the distance around the circle.)
  • He measured the semi-circumference of the arch to estimate the length of the curved path. (Half the perimeter of a curved structure.)

Advanced Usage

• "semi-circumference of a semicircle": In geometry, the semi-circumference of a semicircle is the length of its curved edge, which is half the circumference of the full circle.
  • The semi-circumference of the semicircle is πr, where r is the radius. (The curved part of a half-circle.)

Variants and Related Words

• Semicircle (n): half of a circle, including its diameter and curved edge.
  • The children sat in a semicircle around the teacher. (A half-circle shape.)
• Circumference (n): the complete distance around a circle.
  • The circumference of the Earth is about 40,000 kilometers. (The full perimeter of a circle.)
• Semi-: a prefix meaning "half."
  • A semi-transparent material allows some light to pass through. (Partly transparent.)

Synonyms

• Half-circumference: another term for semi-circumference.
• Half-perimeter: half the distance around a closed shape (less common for circles specifically).

Related Idioms

• Semi-circumference is a technical term; no common idioms exist. However, in mathematical contexts, it is used precisely to describe half a circle's boundary.