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Encyclopedia by subject
51-00 - Geometry :: General reference works
-section of line segment with compass and straightedge
owned by
pahio
and
are irrational
owned by
mathcam
adjacent
owned by
Wkbj79
alternate proof of parallelogram law
owned by
drini
alternative proof of necessity direction of equivalent conditions for triangles (hyperbolic and spherical)
owned by
Wkbj79
angle bisector
owned by
giri
angle sum identity
owned by
mathcam
angles of an isosceles triangle
owned by
Wkbj79
annulus
owned by
akrowne
Apollonius theorem
owned by
yark
Apollonius' circle
owned by
drini
Archimedes' cylinders in cube
owned by
pahio
area
owned by
Wkbj79
area of regular polygon
owned by
Wkbj79
axiomatic geometry
owned by
CWoo
Beltrami-Klein model
owned by
Wkbj79
biangle
owned by
Wkbj79
bound on area of right triangle
owned by
rspuzio
Brahmagupta's formula
owned by
drini
Brianchon theorem
owned by
vmoraru
butterfly theorem
owned by
giri
Carnot circles
owned by
vmoraru
Cassini oval
owned by
pahio
centroid
owned by
drini
chord
owned by
giri
circle
owned by
PrimeFan
circle with given center and given radius
owned by
Wkbj79
circumcircle
owned by
yark
cissoid of Diocles
owned by
pahio
classification of Platonic solids
owned by
mps
collinear
owned by
Wkbj79
comparison of common geometries
owned by
Wkbj79
compass and straightedge construction of angle bisector
owned by
Wkbj79
compass and straightedge construction of center of given circle
owned by
Wkbj79
compass and straightedge construction of duplicating an angle
owned by
Wkbj79
compass and straightedge construction of geometric mean
owned by
Wkbj79
compass and straightedge construction of parallel line
owned by
pahio
compass and straightedge construction of perpendicular
owned by
Wkbj79
compass and straightedge construction of regular pentagon
owned by
Wkbj79
compass and straightedge construction of regular triangle
owned by
Wkbj79
compass and straightedge construction of square
owned by
Wkbj79
complete quadrilateral
owned by
vmoraru
conchoid of Nicomedes
owned by
pahio
concurrent
owned by
drini
concyclic
owned by
CWoo
construct the center of a given circle
owned by
rm50
construction of regular
-gon from regular
-gon
owned by
Wkbj79
construction of tangent
owned by
pahio
converse of isosceles triangle theorem
owned by
Wkbj79
converting between the Beltrami-Klein model and the Poincaré disc model
owned by
Wkbj79
converting between the Poincaré disc model and the upper half plane model
owned by
Wkbj79
coordinate way
owned by
pahio
coordinates of midpoint
owned by
pahio
CPCTC
owned by
Wkbj79
crossed quadrilateral
owned by
pahio
cyclic quadrilateral
owned by
drini
defect
owned by
Wkbj79
derivation of cosines law
owned by
drini
determining from angles that a triangle is isosceles
owned by
Wkbj79
determining when a point is inside a polygon
owned by
matte
diameter
owned by
drini
differential equation of circles
owned by
pahio
differential geometry
owned by
rspuzio
ellipse
owned by
matte
endpoint
owned by
Wkbj79
equiangular polygon
owned by
Wkbj79
equiangular triangle
owned by
Wkbj79
equilateral polygon
owned by
Wkbj79
equilateral triangle
owned by
Mathprof
equivalent conditions for triangles
owned by
Wkbj79
Erdős-Anning Theorem
owned by
giri
Euler line
owned by
drini
fundamental theorem on isogonal lines
owned by
drini
Garfield's proof of Pythagorean theorem
owned by
rm50
generalized Pythagorean theorem
owned by
yogis
geometric constructions by Euclid
owned by
pahio
geometry
owned by
rspuzio
geometry as the study of invariants under certain transformations
owned by
rspuzio
Gergonne point
owned by
drini
Gergonne triangle
owned by
drini
great circle
owned by
Wkbj79
Gregory series
owned by
PrimeFan
height
owned by
Mathprof
Heron's formula
owned by
drini
hexagon
owned by
Wkbj79
hexahedron
owned by
Wkbj79
hyperbola
owned by
pahio
hyperbolic rotation
owned by
CWoo
hypotenuse
owned by
CWoo
ideal triangle
owned by
Wkbj79
index of entries on compass and straightedge constructions
owned by
Wkbj79
isogonal conjugate
owned by
drini
isosceles trapezoid
owned by
Wkbj79
isosceles triangle
owned by
drini
isosceles triangle theorem
owned by
Wkbj79
kite
owned by
yark
Lambert quadrilateral
owned by
Wkbj79
legs
owned by
akrowne
Lemoine circle
owned by
drini
Lemoine point
owned by
drini
length
owned by
PrimeFan
line segment
owned by
matte
linear pair
owned by
Wkbj79
magic circles
owned by
drini
medial triangle
owned by
yark
median
owned by
CWoo
midpoint
owned by
pahio
midpoint
owned by
Mathprof
Miquel point
owned by
vmoraru
Mollweide's equations
owned by
mathwizard
Morley's theorem
owned by
drini
Newton's line
owned by
vmoraru
Newton-Gauss line
owned by
vmoraru
nine-point circle
owned by
mathwizard
non-Euclidean geometry
owned by
Wkbj79
opposite
owned by
Wkbj79
origin
owned by
jirka
orthic triangle
owned by
drini
orthocenter
owned by
Mathprof
parallel lines in hyperbolic geometry
owned by
Wkbj79
parallelogram
owned by
drini
parallelogram law
owned by
drini
Pascal's mystic hexagram
owned by
drini
pedal triangle
owned by
CWoo
pentagon
owned by
rspuzio
perimeter of ellipse
owned by
pahio
phase parametrization in
owned by
perucho
pi
owned by
mathcam
PlanetMath graphics sandbox
owned by
PrimeFan
Poincaré disc model
owned by
Wkbj79
Poincaré upper half plane model
owned by
Wkbj79
point
owned by
Wkbj79
polygon
owned by
Wkbj79
polygon
owned by
Mathprof
pons asinorum
owned by
Wkbj79
primitive
owned by
Wkbj79
prismatoid
owned by
Mathprof
proof of angle sum identities
owned by
rspuzio
proof of Apollonius theorem
owned by
drini
proof of Apollonius theorem
owned by
quincynoodles
proof of Brahmagupta's formula
owned by
giri
proof of butterfly theorem
owned by
drini
proof of double angle identity
owned by
drini
proof of Erdös-Anning Theorem
owned by
lieven
proof of Heron's formula
owned by
mathwizard
proof of Mollweide's equations
owned by
mathwizard
proof of parallelogram law
owned by
Mathprof
proof of Ptolemy's inequality
owned by
mathwizard
proof of Ptolemy's theorem
owned by
drini
proof of Pythagorean theorem
owned by
drini
proof of Pythagorean theorem
owned by
drini
proof of Pythagorean theorem
owned by
rspuzio
proof of Rodrigues' rotation formula
owned by
stevecheng
proof of Simson's line
owned by
giri
proof of Stewart's theorem
owned by
Mathprof
proof of tangents law
owned by
CWoo
proof of Thales' theorem
owned by
mathwizard
proof of when is a point inside a triangle
owned by
joen235
properties of ellipse
owned by
pahio
Ptolemy's theorem
owned by
drini
Pythagorean theorem
owned by
drini
quadrilateral
owned by
drini
radius
owned by
akrowne
Ramanujan's formula for pi
owned by
alozano
rectangle
owned by
drini
regular polygon
owned by
Wkbj79
regular polygon and circles
owned by
pahio
regular polyhedron
owned by
mathwizard
regular triangle
owned by
Wkbj79
rhomboid
owned by
Wkbj79
rhombus
owned by
yark
right trapezoid
owned by
Wkbj79
right triangle
owned by
drini
Rodrigues' rotation formula
owned by
acastaldo
Saccheri quadrilateral
owned by
Wkbj79
scalene triangle
owned by
Wkbj79
Schooten theorem
owned by
mathcam
sector of a circle
owned by
CWoo
semiperimeter
owned by
Wkbj79
similarity in geometry
owned by
pahio
similarity of triangles
owned by
pahio
Simson's line
owned by
drini
sines law
owned by
drini
sines law proof
owned by
drini
sines law proof
owned by
drini
some proofs for triangle theorems
owned by
Wkbj79
square
owned by
drini
Stewart's theorem
owned by
drini
tangent of circle
owned by
pahio
tangents law
owned by
giri
Thales' theorem
owned by
mathwizard
trapezoid
owned by
Wkbj79
triangle
owned by
Wkbj79
triangle center
owned by
mps
triangle solving
owned by
stevecheng
trigonometry
owned by
rm50
unit disc
owned by
PrimeFan
volume
owned by
Wkbj79
volume as integral
owned by
pahio
when is a point inside a triangle
owned by
matte
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