Krillion Recorded answers
251 recorded answers
How to approach it
Treat the prompt as a vocabulary retrieval task rather than a definition task. Begin by listing the words a school syllabus attaches to drawn figures, then push into the terminology used by competitive mathematics and specialist reference works, where nearly every classical configuration has been given its own label. Read the judging rules carefully: the target is a component of a figure, so whole-figure names, measurements expressed as formulas, and playful inventions all fall outside. From your list, keep the entries you can defend in one clause — a label a textbook would print beside a diagram. Rank what remains by how unusual it is, because the scoring rewards the deepest cut of the specialist glossary over the half-dozen words every solver will produce. Submit the rarest term you can define correctly.
Get a hint
Geometry keeps a separate vocabulary for the anatomy of figures — the labels printed next to a diagram, not the names of the figures themselves. Start with whatever a school textbook circles in ink.
A little more
Widen past the obvious: the vocabulary runs from simple measurable features of circles and solids to the elaborate named points and reference lines that specialist literature attaches to a single figure.
One step further
Go hunting through glossary entries, diagram keys and index pages of advanced geometry, then choose the term whose obscurity matches how rarely a casual solver would reach for it.
Reveal answers 251
- Yff pointDeep Cut85points
- Yff-Malfatti pointDeep Cut85points
- Yiu angle pointDeep Cut85points
- Angle bisectorRare60points
- ApexRare60points
- ArchRare60points
- AxisRare60points
- Base angleRare60points
- Base edgeRare60points
- Central angleRare60points
- CentroidRare60points
- EndpointRare60points
- Exterior angleRare60points
- FocusRare60points
- Great circleRare60points
- HemisphereRare60points
- Inscribed angleRare60points
- InteriorRare60points
- Lateral edgeRare60points
- Lateral faceRare60points
- LegRare60points
- MedianRare60points
- MidpointRare60points
- Perpendicular bisectorRare60points
- Plane of symmetryRare60points
- QuadrantRare60points
- SectorRare60points
- SegmentRare60points
- Slant heightRare60points
- Vertex angleRare60points
- AltitudeSchooler30points
- ArcSchooler30points
- Axis of symmetrySchooler30points
- BaseSchooler30points
- CentreSchooler30points
- ChordSchooler30points
- CircumferenceSchooler30points
- DiagonalSchooler30points
- ExteriorSchooler30points
- FaceSchooler30points
- HypotenuseSchooler30points
- Interior angleSchooler30points
- PerimeterSchooler30points
- SemicircleSchooler30points
- SurfaceSchooler30points
- VertexSchooler30points
- AnglePlankton10points
- DiameterPlankton10points
- EdgePlankton10points
- RadiusPlankton10points
Why these answers count
Scoring here tracks rarity within the accepted set, and the spread is unusually flat: of 249 recorded answers, 228 cleared the top band, with 201 landing on 85 points and only 26 on 60. The single 100-point answer, Sagitta, is the height of a circular arc measured from chord to curve, a term that lives in surveying and drafting rather than school revision, so almost nobody reaches it first. The 85-point band is the deep shelf of the subject: Apothem, Circumcenter, Inradius, Dihedral angle — terms a strong student recognises but a casual solver never volunteers. The 60-point group is the crowded middle, the handful of features anyone can name in ten seconds, which the grading treats as necessary but unremarkable. Practical reading: length is not what pays, obscurity plus defensibility is. A two-word phrase no one else thought of beats a correct but obvious one by a wide margin, and the one outlier at the top shows how far that logic stretches.