semi-circle
Diameter caps it
A semi-circle is half of a circle—the shape formed when a circle is divided along its diameter.
The term applies to any roughly half-round shape or arrangement: The students sat in a semi-circle around the teacher.
Also spelled semicircle.
Curved line segment
- diameterDistance across through center
- radiusCenter-to-perimeter distance
- chordNotes sounded simultaneously
- curveSmooth, angleless line
sector · segment · bisect · protractor · circumference · perimeter · angle · tangent
Curved spanning structure
- arcadeArched passageway or gaming hall
- vaultSecure storage chamber
- apseVaulted church recess
- archwayCurved overhead passage
rotunda · dome · cupola · amphitheater · colonnade · portico · niche · alcove
Lunar phase showing half
- crescentCurved sickle-like arc
- waxingCoating for shine
- waningGradually decreasing in intensity
- phasesDistinct periods in sequence
gibbous · eclipse · lunar · celestial · moonrise · moonset · cycle · orbit
Close protective gathering
- formationCreation or arrangement
- gatheringCollection of people meeting
- seatingAvailable places to sit
- roundtableLeaderless group discussion
conference · campfire · audience · amphitheater · theater · orchestra · assembly · discussion
arc
Curved line segment
- diameterDistance across through center
- radiusCenter-to-perimeter distance
- chordNotes sounded simultaneously
curve · sector · segment · bisect · protractor · circumference · perimeter · angle · tangent · sine
arch
Curved spanning structure
archway · rotunda · dome · cupola · amphitheater · colonnade · portico · niche · alcove · lunette
halfmoon
Lunar phase showing half
phases · gibbous · eclipse · lunar · celestial · moonrise · moonset · cycle · orbit · nocturnal
huddle
Close protective gathering
roundtable · conference · campfire · audience · amphitheater · theater · orchestra · assembly · discussion · presentation
semi-circlefull circle
Return to origin
circle · ring · closed loop · quadrant
semi-circlestraight line
Undeviated continuous path
rectangle · square · triangle · polygon · line segment