semicircles

Halves of rings

Semicircles is the plural of semicircle—a half circle, the shape formed when a circle is divided along its diameter.

The term appears in geometry, architecture, and everyday description: The chairs were arranged in semicircles facing the stage.

Roman arches form semicircles.

geometry

arc

Curved line segment

  • diameterDistance across through center
  • radiusCenter-to-perimeter distance
  • chordNotes sounded simultaneously

protractor · tangent · bisect · curve · segment · sector · compass · pi · hemicycle · perpendicular

architecture

arch

Curved spanning structure

  • apseVaulted church recess
  • lunetteCrescent-shaped architectural opening
  • fanlightSemicircular window over doorway

transom · doorway · window · Romanesque · vault · niche · alcove · portico · pediment · rotunda

design

logo

Company identifying symbol

  • iconPictorial screen symbol
  • badgeWorn symbol of membership
  • emblemRepresentational sign or device

graphic · motif · pattern · border · frame · ornament · medallion · roundel · crescent · scallop

motion

sweep

Brush clean with broom

pendulum · metronome · oscillation · radial · spinning · turning · swivel · trajectory · gyration

arrangement

amphitheater

Open-air tiered venue

horseshoe · U-shape · formation · council · audience · orchestra · tiered · stadium · arena · conference

Opposites
curvature type

semicirclesstraight lines

Unbent one-dimensional figures

rectangles · squares · triangles · polygons · line segments

geometric completeness

semicirclesfull circles

360-degree turns

circles · closed loops · rings · ovals · ellipses

Family

semicircle

Familiarity
Top 100,000
Profile
Known to kids · Used worldwide · Timeless · Concrete · Everyday, not technical · Rated G