Worlds of David Darling
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GEOMETRY




   • acute
   • affine geometry
   • alternate
   • altitude
   • angle
   • annulus
   • apex
   • apothem
   • Apollonius problem
   • arc
   • area
   • asymptote
   • Aubel's theorem
   • axis
   • axis of symmetry

   • Bang's theorem
   • bisect
   • bisecting an angle
   • Blanche's dissection
   • Brianchon's theorem
   • butterfly theorem

   • cannonball problem
   • cathetus
   • Cavalieri's principle
   • center of perspective
   • central angle
   • centroid
   • chord
   • circumcenter
   • circumference
   • circumscription
   • commensurable
   • compasses
   • complementary angles
   • congruent
   • constructible
   • coplanar
   • correspondence
   • cosine rule
   • curvature
   • curvature tensor
   • curve

   • de Malve's theorem
   • Descarte's circle theorem
   • descriptive geometry
   • diagonal
   • diameter
   • differential geometry
   • dihedral angle
   • dimension
   • dissection
   • duplicating the cube

   • equichordal point
   • equilateral
   • elliptical geometry
   • Euclidean geometry
   • Euclidean space
   • Euclid's postulates
   • Euler line
   • exterior angle

   • Fagnano's problem
   • Flatland
   • focal chord
   • focal radius
   • focus
   • four coins problem
   • fourth dimension

   • geodesic
   • geometry
   • Gergonne point
   • great circle

   • Hadwiger problem
   • half-line
   • half-plane
   • harmonic division
   • harmonic points
   • Hero's formula
   • higher dimensions
   • hole-through-a-sphere problem
   • hyperbolic geometry
   • hypercube
   • hypersphere
   • hypotenuse

   • incenter
   • inscribed angle
   • inscription
   • isogonal conjugate
   • isometry
   • isoperimetric inequality
   • isosceles
   • isotomic conjugate
   • isovolume problem

   • Johnson's theorem

   • Kakeya needle problem
   • Kakeya needle problem

   • Langley's adventitious angles
   • lattice point
   • latus rectum
   • length
   • line
   • loculus of Archimedes
   • locus

   • major axis
   • map
   • Mascheroni construction
   • metric
   • mensuration
   • midpoint
   • minor axis
   • Morley's miracle
   • moving sofa problem

   • Nagel point
   • Neusis construction
   • nine-point circle
   • non-Euclidean geometry
   • normal

   • oblique
   • obtuse
   • opposite angles
   • orthocenter
   • orthogonal
   • osculating

   • packing
   • parallel
   • parallel postulate
   • Pascal's mystic hexagon
   • perimeter
   • periphery
   • perpendicular
   • perspective
   • Pick's theorem
   • plane
   • point
   • polytope
   • Poncelet's theorem
   • Prince Rupert's problem
   • projection
   • projective geometry
   • prolate
   • protractor
   • Ptolemy's theorem
   • Pythagoras's theorem

   • quadrature

   • radial symmetry
   • radical axis
   • radius
   • ray
   • reentrant angle
   • reflection
   • reflex angle
   • Riemannian geometry
   • right
   • rope-around-the-Earth puzzle
   • rotation
   • ruler-and-compass construction

   • salient
   • secant
   • sector
   • segment
   • self-intersecting
   • set square
   • similar
   • six circles theorem
   • skew lines
   • Soddy's formula
   • Sperner's lemma
   • spherical coordinates
   • spherometer
   • squaring the circle
   • squaring the square
   • Steiner-Lehmus theorem
   • straight
   • supplementary angles
   • Sylvester's problem of collinear points
   • symmedian

   • tangent
   • transformation
   • translation
   • transversal
   • trigonometric function
   • trigonometry
   • trihedron
   • trisecting an angle
   • trisector theorem
   • two-dimensional worlds

   • unilluminable room problem

   • vertex
   • Viviani's theorem
   • volume

Related categories

   • ANALYTICAL GEOMETRY
   • GAMES AND PUZZLES
   • PLANE CURVES
   • POLYGONS
   • SPACE AND TIME


Related supercategory

   • MATHEMATICS