trilinear polarity
cycloid
orthogonium
hypocycloid
roulette
Pasch's axiom
triangular
Euler line
cevian
epicycloid
orthocentric
Brocard point
witch of Agnesi
Steiner point
trifan
diameter
radius
subcontrary
Lemoine hexagon
hypotrochoid
acute triangle
oblique triangle
center
median
symmedian
Morley triangle
plane curve
rose curve
noncentrosymmetrical
Alhazen's problem
triforce
Morley's trisector theorem
spheroconic
Pasch's theorem
Brocard triangle
conics
conic section
parabola
hyperkagome
deltoideus
conic
orthocenter
spherical trigonometry
orthogon
incircle
triangled
Malfatti circle
diam
Ceva's theorem
trigonic
excircle
angular defect
midcircle
hyperoval
obdeltate
triangle
tri
trianglewise
control point
scalene triangle
radical plane
cotangent
Miquel's theorem
circumscriptable
scalene
equitriangular
squarefree
noncentrosymmetric
aphylactic
obtuse triangle
acute-angled
squircular
triangularity
obtuse-angled triangle
δ-hyperbolic
zerogon
circumcircle
base angle
Gougu
nonhypotenuse
right-angled triangle
ellipse
vertical angle
right triangle
salient angle
nontriangular
Cremona-Richmond configuration
caudoventrally
trigon
rotund
acute-angled triangle
r
polygonal chain
circle
apothem