Linked from

The 76 pages that link to Circle, each with the reason it gives.

• Surface of revolutionRelated: Rotating a circle in its plane around a coplanar axis produces familiar toroidal or spherical cases.

• Vitruvian ManRelated: The outstretched limbs fit a circular boundary in Leonardo's construction.

• Borsuk–Ulam theoremBroader topic: For a circle mapped continuously to the real line, some opposite pair has equal values.

• Jafar PanahiBroader topic: This film makes the constraints on women central through its linked, circular structure.

• Tangent–secant theoremNarrower topic: The theorem applies to a tangent and secant drawn to this curve.

• Descartes' theoremNarrower topic: Each object in the theorem is a circle described by its radius and curvature.

• 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.

• Barbier's theoremRelated: Its circumference is 2πr, exactly π times its width 2r.

• Intersecting secants theoremNarrower topic: The theorem’s equal-product relation depends on intersections with this curve.

• Inversive geometryRelated: The circle of inversion determines the reciprocal distances and remains pointwise fixed.

• Pie chartNarrower topic: The whole dataset is represented by one complete circle.

• Poncelet–Steiner theoremRelated: Its fixed boundary provides the metric reference absent from a bare straightedge.

• MilliradianNarrower topic: Radians are defined through arc length and radius on a circle.

• Monge's theoremNarrower topic: The planar objects whose pairwise similitude centers the theorem aligns.

• Pizza theoremBroader topic: A disk has a circular boundary, but the area argument also extends beyond circles.

• Six circles theoremNarrower topic: Every object in the theorem is a circle in the Euclidean plane.

• Tusi coupleNarrower topic: The mechanism's result depends on coordinating two circles with a particular size ratio.

• Constant chord theoremNarrower topic: The theorem concerns chords within one circle, where a common radius makes arc and chord comparisons possible.

• DecagonCompared with: A circle has a continuous curved boundary, unlike a decagon’s ten straight sides.

• Five circles theoremNarrower topic: The five objects in the configuration are circles.

• Four-vertex theoremBroader topic: Every point has the same curvature, so every point is both a local maximum and minimum under non-strict conventions.

• Honeycomb theoremCompared with: A circle is optimal for one enclosed region, but circles cannot tile the plane.

• Japanese theoremNarrower topic: The quadrilateral’s vertices lie on a circle, which imposes its angle constraints.

• Proof that π is irrationalRelated: The circumference-to-diameter ratio defining π comes from circle geometry.

• Seven circles theoremNarrower topic: The theorem specializes a broader geometry of circle incidence and intersection.