semicircle

/'semi,sə:kl/

Thân thiện

The children sit in a semicircle on the rug for story time.

Definition

Noun: A two-dimensional geometric figure that is exactly one half of a circle, bounded by a diameter (a straight line segment) and the arc of the circle connecting the two endpoints of that diameter.

Usage

The word "semicircle" is used to describe the shape of an object, an arrangement of people or things, or a specific geometric area. * The students sat in a semicircle around the teacher. * The architect designed a window in the shape of a semicircle. * Calculate the perimeter of the semicircle.

Examples

• The moon appeared as a bright semicircle in the evening sky.
• For the meeting, the chairs were arranged in a semicircle to encourage discussion.
• The formula for the area of a semicircle is (πr²)/2.

Advanced Usage

• In a semicircle: Describes the positioning of multiple items to form this shape.
  • The ancient stones were placed in a semicircle, possibly for ceremonial purposes.
• Semicircular: The related adjective form, meaning having the shape of a semicircle.
  • The room featured a large semicircular balcony.

Variants and Related Words

• Semicircular (adjective): Having the form of a semicircle.
  • The semicircular canal is a part of the inner ear.
• Hemicycle (noun): A synonym often used in architectural or formal contexts to describe a semicircular structure or arrangement.
  • The parliament chamber was designed as a hemicycle.

Synonyms

• Half-circle
• Hemicycle (more formal/architectural)

Different Meanings

The word "semicircle" is highly specific and does not have common, distinct metaphorical meanings. Its use is almost exclusively geometric or descriptive of shape and arrangement.

Học thuật

Noun

1. a plane figure with the shape of half a circle

Từ đồng nghĩa

• hemicycle