Concept
Circle
2 essays name this object, across one field. What follows is each of them, and the objects they name alongside it.
An angle that does not care where it stands
Fix two points on a circle and look at them from anywhere else on the far arc. The angle is the same from every one of those places, and it is exactly half the angle at the centre.
The plane, divided by whoever is nearest
Scatter some points and colour every other point of the plane by which one is closest. The result is a tiling nobody designed, and its dual triangulation has a property that no part of the construction mentions.
Named alongside it
The objects these essays reach for when they reach for this one.
AngleCentral angleConvexityCyclic quadrilateralDelaunay triangulationDualityEuler characteristicInscribed angleIsosceles triangleLocusNearest neighbourPerpendicular bisector