KnowraCircleLinked fromLinked fromThe 76 pages that link to Circle, each with the reason it gives.All 76Broader topic 14Related 27Narrower topic 25Compared with 10PolygonCompared with: A circle has a curved boundary, unlike a polygon’s straight sides.Simply connected spaceCompared with: Its noncontractible loop makes it a basic example that is not simply connected.EllipseCompared with: A circle is the limiting symmetric case of an ellipse, with coincident foci.Regular polygonCompared with: As the number of sides grows, suitably scaled regular polygons approximate a circle.ParabolaCompared with: Unlike a parabola, a circle has a center and no directrix-based definition.Semimajor axisCompared with: A circle has equal semiaxes, so its semimajor axis is simply its radius.Koch snowflakeCompared with: A circle has finite perimeter and smooth curvature, unlike the snowflake boundary.Reuleaux triangleCompared with: A circle has constant width too, but unlike the Reuleaux triangle it has a continuously curved boundary.DecagonCompared with: A circle has a continuous curved boundary, unlike a decagon’s ten straight sides.Honeycomb theoremCompared with: A circle is optimal for one enclosed region, but circles cannot tile the plane.