circumference
Distance around circle
Circumference is the distance around a circle or curved shape—the perimeter of something round.
The circumference of the Earth at the equator is about 25,000 miles.
By extension, it can mean the outer boundary of any area: We walked the circumference of the lake.
In geometry, circumference equals pi times the diameter.
Distance across through center
- radiusCenter-to-perimeter distance
- piCircle's fundamental ratio
- arcCurved line segment
- chordNotes sounded simultaneously
tangent · sector · segment · ellipse · area · perimeter · annulus · formula
Shape's outer edge length
- edgeBoundary or sharpness
- rimCircular outer boundary
- borderOuter edge or limit
- outlineSummary of key elements
contour · periphery · margin · enclosure · encircling · surrounding · encompassing · outer limit
diameter
Distance across through center
chord · tangent · sector · segment · ellipse · area · perimeter · annulus · formula · calculation
perimeter
Shape's outer edge length
outline · contour · periphery · margin · enclosure · encircling · surrounding · encompassing · outer limit · bounds
tape measure
Flexible marked length finder
barrel · wheel · pipe · cylinder · hoop · ring · sizing · gauge · calipers · dimension
sphere
Perfectly round solid
ring · hoop · loop · orb · ball · cylinder · oval · elliptical · curved · rotation
- geometryangles, circles, angle, shapes, lines
- mathaddition, subtraction, multiplication, division, algebra
- long wordssupercalifragilisticexpialidocious, antidisestablishmentarianism, incomprehensibilities, counterrevolutionary, electroencephalograph
- measurementsheight, stature, meters, depth, pound
- geometry termsline, rectangle, side, square, triangle
- body measurementsheight, weight, shoulder width, leg length, waist size
- head circumferenceDistance around the skull
- waist circumferenceMidsection perimeter measurement