WCircleW25 great circles of the spherical octahedronW31 great circles of the spherical icosahedronWAnnulus (mathematics)WApollonian circlesWArea of a circleWAristotle's wheel paradoxWBiarcWCenter pivot irrigationWCentral angleWCircle graphWCircle of antisimilitudeWCircular layoutWCircular sectorWCircumferenceWCircumgonWCircumscribed circleWCrop circleWCyclic orderWDiameterWDirector circleWDividing a circle into areasWEnsōWExtouch triangleWGeometry of Complex NumbersWGreat circleWHexafoilWHomothetic centerWIce circleWJohnson circlesWLimiting point (geometry)WList of circle topicsWLune of HippocratesWOsculating circleWPole and polarWRadical axisWRadiusWRegiomontanus' angle maximization problemWRiemannian circleWRobbins pentagonWRoundelWSchinzel circleWSmallest-circle problemWSteiner chainWUnit circleWUnit diskWVillarceau circlesWWoo circles
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