Krillion #100 · Prompt 3 of 7

Name a part of a 2D or 3D shape (like a radius).

October 23, 2026: 251 accepted answers, grouped by tier from rarest to most obvious. Every answer in a tier scores the same. Checked 05:15 UTC. Just want a hint?

Gem answer

SagittaKrillionLatin for arrow: the segment from an arc's midpoint to its chord.

What players picked most

Share of this prompt's players, counted at 05:14 UTC on October 23. The tier was set before anyone played, so a common answer can still score high.

Answer	Tier	Players	Share
Circumference	Schooler	19,736	16%
Vertex	Schooler	16,744	14%
Diameter	Plankton	10,265	8.5%
Hypotenuse	Schooler	9,683	8.1%
Angle	Plankton	9,211	7.7%
Arc	Schooler	4,508	3.8%
Perimeter	Schooler	3,963	3.3%
Edge	Plankton	3,852	3.2%
Radius	Plankton	3,645	3%
Apex	Rare	3,544	2.9%

All 251 answers, by tier

The number after an answer is how many players gave it; no number means nobody had, as of 05:14 UTC on October 23.

Krillion100 pts · 1,000 m · 1 answer

Sagittagem answer338

Deep cut85 pts · 850 m · 202 answers · 113 picked by someone

A

Acamar point5
Ajima-Malfatti point
Angle of a segment33
Angle trisector58
Anticenter56
Antiorthic axis
Antipode128
Aperture205
Apollonius point
Apothem554
Apsis435
Arm168

B

Bailey point3
Bare angle center
Bevan point
Bialtitude4
Bimedian8
Branch19
Brianchon point
Brocard angle
Brocard axis
Brocard midpoint
Brocard point1

C

Cevian13
Chamfer277
Circumcenter459
Circumradius103
Clawson point
Cleaver5
Co-vertex44
Congruent incircles point1
Congruent isoscelizers point
Conjugate axis4
Conjugate diameter
Core of a star polygon
Cusp142
Cylindrical segment1
Cylindrical wedge3

D

De Longchamps line
De Longchamps point1
De Villiers point
Diagonal point2
Dihedral angle53
Droussent pivot

E

Ear8
Ehrmann congruent squares point
Ehrmann point1
Eigencenter16
Elkies point
Eppstein point8
Equal parallelians point
Equal perimeters isoscelizer point
Equatorial radius1
Equi-Brocard center
Equilateral cevian triangle point1
Euler line56
Evans point
Excenter23
Exeter point
Exmedian
Exmedian point
Exradius25
Exsymmedian
External angle bisector3

F

Face angle5
Face diagonal11
Far-out point
Fermat axis
Fermat point4
Feuerbach antipode
Feuerbach point1
Fillet179
Fletcher point
Focal chord9
Focal radius15
Focus of the Kiepert parabola
Foot of the altitude2
Fuhrmann center

G

Generating circle
Generatrix36
Gergonne line
Gergonne point2
Gibert point
Gnomon6
Gossard perspector1
Griffiths point

H

Half-angle29
Hatzipolakis-Yiu point
Hofstadter point1
Hofstadter trapezoid point
Hyperbolic sector

I

Incenter102
Inflection point314
Inner equator1
Inner radius106
Inradius57
Isodynamic point
Isogonal mittenpunkt
Isoscelizer
Isoscelizer point

J

Jerabek antipode
Jerabek center
Johnson midpoint

K

Kenmotu point
Kenmotu-van Lamoen point
Kiepert antipode
Kiepert center
Kosnita point

L

Latus rectum78
Lemoine axis
Lobe33
Longuet-Higgins point
Lune30

M

Major axis80
Major radius6
Maltitude4
Meridian95
Mid-arc point4
Midradius8
Midsegment64
Minor axis55
Minor radius9
Miquel point6
Mittenpunkt171
Monge point
Morley center
Mouth3

N

Nagel line
Nagel point2
Napoleon point
Nappe2
Neuberg center
Newton line
Nine-point center8
Nobbs point1
Node263
Nonant

O

Octant22
Orthic axis
Orthocenter350
Outer equator1
Outer radius22

P

Parabolic segment3
Parallelian11
Parry point
Petal2
Point of tangency77
Polar radius11
Pole94
Polyhedral angle3
Power point6
Prasolov point

R

Rigby point

S

Schiffler point1
Schoute center
Semi-axis9
Semi-latus rectum13
Semi-major axis77
Semi-minor axis37
Semiordinate
Sextant37
Sharygin point
Simson line5
Small circle1
Soddy center1
Soddy line
Solid angle58
Space diagonal76
Spherical angle2
Spherical cap61
Spherical sector8
Spherical segment
Spherical wedge3
Spherical zone37
Spieker center
Spire39
Splitter
Steiner curvature centroid
Steiner point
Symmedian8
Symmedian point

T

Tarry point
Taylor center
Third Brocard point
Tixier point
Transverse axis15
Trisected perimeter point
Trisection point4

U

Umbilic4

V

Van Aubel line
Van Lamoen circumcenters point
Vecten point13
Vertex centroid
Vertex figure7
Villarceau circles

W

Wabash center
Weill point

Y

Yff center of congruence
Yff parabolic point
Yff point1
Yff-Malfatti point
Yiu angle point

Rare60 pts · 600 m · 27 answers · 27 picked by someone

Angle bisector498
Apex3,544
Arch521
Axis2,682
Base angle15
Base edge5
Central angle24
Centroid1,114
Endpoint87
Exterior angle423
Focus1,183
Great circle300
Hemisphere467
Inscribed angle29
Interior211
Lateral edge34
Lateral face19
Leg312
Median608
Midpoint475
Perpendicular bisector224
Plane of symmetry29
Quadrant240
Sector1,531
Segment915
Slant height682
Vertex angle33

Schooler30 pts · 300 m · 16 answers · 16 picked by someone

Altitude2,211
Arc4,508
Axis of symmetry275
Base1,325
Centre1,306
Chord3,440
Circumference19,736
Diagonal1,105
Exterior53
Face2,371
Hypotenuse9,683
Interior angle785
Perimeter3,963
Semicircle77
Surface1,171
Vertex16,744

Plankton10 pts · 100 m · 5 answers · 5 picked by someone

Angle9,211
Diameter10,265
Edge3,852
Radius3,645
Side2,062

Questions about this prompt

What is the rarest answer to “Name a part of a 2D or 3D shape (like a radius).”?

The rarest tier on this sheet is Krillion, worth 100 points. Its only answer is Sagitta.

How many answers does “Name a part of a 2D or 3D shape (like a radius).” accept?

251 answers, in 5 tiers: Krillion 1 (100 points), Deep cut 202 (85 points), Rare 27 (60 points), Schooler 16 (30 points), Plankton 5 (10 points). Every answer in a tier scores the same.

What was the most common answer to “Name a part of a 2D or 3D shape (like a radius).”?

Circumference, given by 19,736 players (16%) as of 05:14 UTC on October 23. It sits in the Schooler tier, worth 30 points.

Is my answer to “Name a part of a 2D or 3D shape (like a radius).” accepted?

Type it in the Check your answer box at the top of this page, or find it in the tier lists, which run A to Z. If the game corrected your spelling, look for the corrected form.