In Euclidean geometry.doc

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    http://en.wikipedia.org/wiki/Image:Circle_center_a_b_radius_r.pnghttp://en.wikipedia.org/wiki/Euclidean_geometryhttp://en.wikipedia.org/wiki/Sethttp://en.wikipedia.org/wiki/Point_(geometry)http://en.wikipedia.org/wiki/Distancehttp://en.wikipedia.org/wiki/Radiushttp://en.wikipedia.org/wiki/Curvehttp://en.wikipedia.org/wiki/Circumferencehttp://en.wikipedia.org/wiki/Disk_(mathematics)http://en.wikipedia.org/wiki/Arc_(geometry)http://en.wikipedia.org/wiki/Continuous_function_(topology)http://en.wikipedia.org/wiki/Ellipsehttp://en.wikipedia.org/wiki/Focus_(geometry)http://en.wikipedia.org/wiki/Conic_sectionhttp://en.wikipedia.org/wiki/Conical_surfacehttp://en.wikipedia.org/wiki/Coordinate_systemhttp://en.wikipedia.org/wiki/Pythagorean_theorem
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    http://en.wikipedia.org/wiki/Image:CIRCLE_LINES.svghttp://en.wikipedia.org/wiki/Formulahttp://en.wikipedia.org/wiki/Tangenthttp://en.wikipedia.org/wiki/Parametric_equationshttp://en.wikipedia.org/wiki/Trigonometric_functionhttp://en.wikipedia.org/wiki/Trigonometric_functionhttp://en.wikipedia.org/wiki/Parametric_variablehttp://en.wikipedia.org/wiki/Homogeneous_coordinateshttp://en.wikipedia.org/wiki/Conic_sectionhttp://en.wikipedia.org/wiki/Circular_points_at_infinityhttp://en.wikipedia.org/wiki/Polar_coordinateshttp://en.wikipedia.org/wiki/Complex_plane
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    http://en.wikipedia.org/wiki/Circumferencehttp://en.wikipedia.org/wiki/Diameter
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    http://en.wikipedia.org/wiki/Image:Circle_Area.svghttp://en.wikipedia.org/wiki/Image:Circle_Area.svghttp://en.wikipedia.org/wiki/Area_of_a_diskhttp://en.wikipedia.org/wiki/Area_of_a_diskhttp://en.wikipedia.org/wiki/Circumscribehttp://en.wikipedia.org/wiki/Isoperimetryhttp://en.wikipedia.org/wiki/Reflection_symmetryhttp://en.wikipedia.org/wiki/Rotational_symmetryhttp://en.wikipedia.org/wiki/Symmetry_grouphttp://en.wikipedia.org/wiki/Orthogonal_grouphttp://en.wikipedia.org/wiki/Circle_grouphttp://en.wikipedia.org/wiki/Similarity_(mathematics)http://en.wikipedia.org/wiki/Proportionality_(mathematics)http://en.wikipedia.org/wiki/Area_(geometry)http://en.wikipedia.org/wiki/Proportionality_(mathematics)http://en.wikipedia.org/wiki/Mathematical_constanthttp://en.wikipedia.org/wiki/Pihttp://en.wikipedia.org/wiki/Unit_circle
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    http://en.wikipedia.org/wiki/Line_segmenthttp://en.wikipedia.org/wiki/Circular_segmenthttp://en.wikipedia.org/wiki/Inscribed_anglehttp://en.wikipedia.org/wiki/Pythagorean_theoremhttp://en.wikipedia.org/wiki/Pythagorean_theoremhttp://en.wikipedia.org/w/index.php?title=Circle&action=edit&section=12
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    http://en.wikipedia.org/wiki/Image:Inscribed_angle_theorem.svghttp://en.wikipedia.org/wiki/Image:Inscribed_angle_theorem.svghttp://en.wikipedia.org/wiki/Image:Secant-Secant_Theorem.svghttp://en.wikipedia.org/wiki/Image:Secant-Secant_Theorem.svghttp://en.wikipedia.org/wiki/Power_of_a_pointhttp://en.wikipedia.org/wiki/Secant
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    http://en.wikipedia.org/wiki/Image:Apollonius_circle_definition_labels.svghttp://en.wikipedia.org/wiki/Image:Apollonius_circle_definition_labels.svghttp://en.wikipedia.org/wiki/Inscribed_anglehttp://en.wikipedia.org/wiki/Central_anglehttp://en.wikipedia.org/wiki/Diameterhttp://en.wikipedia.org/wiki/Right_anglehttp://en.wikipedia.org/wiki/Apollonius_of_Pergahttp://en.wikipedia.org/wiki/Right_anglehttp://en.wikipedia.org/wiki/Right_angle
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    http://en.wikipedia.org/wiki/Image:Triangle.Acute.svghttp://en.wikipedia.org/wiki/Image:Triangle.Obtuse.svghttp://en.wikipedia.org/wiki/Image:Triangle.Right.svghttp://en.wikipedia.org/wiki/Image:Triangle.Scalene.svghttp://en.wikipedia.org/wiki/Image:Triangle.Isosceles.svghttp://en.wikipedia.org/wiki/Image:Triangle.Equilateral.svghttp://en.wikipedia.org/wiki/Shapehttp://en.wikipedia.org/wiki/Geometryhttp://en.wikipedia.org/wiki/Polygonhttp://en.wiktionary.org/wiki/vertexhttp://en.wikipedia.org/wiki/Distance_geometry#straighthttp://en.wikipedia.org/wiki/Line_segmenthttp://en.wikipedia.org/wiki/Equilateral_trianglehttp://en.wikipedia.org/wiki/Equiangular_polygonhttp://en.wikipedia.org/wiki/Anglehttp://en.wikipedia.org/wiki/Regular_polygonhttp://en.wikipedia.org/wiki/Triangle#_note-0%23_note-0http://en.wikipedia.org/wiki/Triangle#_note-1%23_note-1http://en.wikipedia.org/wiki/Triangle#_note-2%23_note-2http://en.wikipedia.org/wiki/Degree_(angle)http://en.wikipedia.org/wiki/Special_right_triangleshttp://en.wikipedia.org/wiki/Anglehttp://en.wikipedia.org/wiki/Hypotenusehttp://en.wiktionary.org/wiki/cathetushttp://en.wikipedia.org/wiki/Anglehttp://en.wikipedia.org/wiki/Anglehttp://en.wikipedia.org/wiki/Angle
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    http://en.wikipedia.org/wiki/Euclidhttp://en.wikipedia.org/wiki/Euclid's_Elementshttp://en.wikipedia.org/wiki/300_BCEhttp://en.wikipedia.org/wiki/Polygonhttp://en.wikipedia.org/wiki/Simplexhttp://en.wikipedia.org/wiki/Polytopehttp://en.wikipedia.org/wiki/Dimensionhttp://en.wikipedia.org/wiki/Internal_anglehttp://en.wikipedia.org/wiki/Convexhttp://en.wikipedia.org/wiki/Triangle_inequalityhttp://en.wikipedia.org/wiki/Similarity_(mathematics)http://en.wikipedia.org/wiki/Proportionality_(mathematics)
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    http://en.wikipedia.org/wiki/Image:Pythagorean.svghttp://en.wikipedia.org/wiki/Image:Pythagorean.svghttp://en.wikipedia.org/wiki/Trigonometric_functionhttp://en.wikipedia.org/wiki/Anglehttp://en.wikipedia.org/wiki/Trigonometryhttp://en.wikipedia.org/wiki/Pythagorean_theoremhttp://en.wikipedia.org/wiki/Hypotenusehttp://en.wikipedia.org/wiki/Complementary_angleshttp://en.wikipedia.org/wiki/Law_of_cosineshttp://en.wikipedia.org/wiki/Law_of_sines
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    http://en.wikipedia.org/wiki/Image:Triangle.Orthocenter.svghttp://en.wikipedia.org/wiki/Image:Triangle.Circumcenter.svghttp://en.wikipedia.org/wiki/Ceva's_theoremhttp://en.wikipedia.org/wiki/Concurrent_lineshttp://en.wikipedia.org/wiki/Collinearhttp://en.wikipedia.org/wiki/Menelaus'_theoremhttp://en.wikipedia.org/wiki/Circumcenterhttp://en.wikipedia.org/wiki/Bisectionhttp://en.wikipedia.org/wiki/Circumcenterhttp://en.wikipedia.org/wiki/Circumcirclehttp://en.wikipedia.org/wiki/Circlehttp://en.wikipedia.org/wiki/Thales'_theoremhttp://en.wikipedia.org/wiki/Orthocenterhttp://en.wikipedia.org/wiki/Altitude_(triangle)http://en.wikipedia.org/wiki/Orthocenter
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    http://en.wikipedia.org/wiki/Image:Triangle.Centroid.svghttp://en.wikipedia.org/wiki/Image:Triangle.Incircle.svghttp://en.wikipedia.org/wiki/Orthocentric_systemhttp://en.wikipedia.org/wiki/Incirclehttp://en.wikipedia.org/wiki/Angle_bisectorhttp://en.wikipedia.org/wiki/Incenterhttp://en.wikipedia.org/wiki/Incirclehttp://en.wikipedia.org/wiki/Excirclehttp://en.wikipedia.org/wiki/Orthocentric_systemhttp://en.wikipedia.org/wiki/Centroidhttp://en.wikipedia.org/wiki/Median_(geometry)http://en.wikipedia.org/wiki/Centroidhttp://en.wikipedia.org/wiki/Center_of_gravity
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    http://en.wikipedia.org/wiki/Image:Triangle.TrigArea.svghttp://en.wikipedia.org/wiki/Triangle#_note-3%23_note-3http://en.wikipedia.org/wiki/Vector_(spatial)http://en.wikipedia.org/wiki/Cross_producthttp://en.wikipedia.org/wiki/Dot_producthttp://en.wikipedia.org/wiki/Trigonometry
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    http://en.wikipedia.org/wiki/Cartesian_coordinate_systemhttp://en.wikipedia.org/wiki/Absolute_valuehttp://en.wikipedia.org/wiki/Determinanthttp://en.wikipedia.org/wiki/Heron's_formula
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    http://en.wikipedia.org/wiki/Geometryhttp://en.wikipedia.org/wiki/Polygonhttp://en.wikipedia.org/wiki/Trianglehttp://en.wikipedia.org/wiki/Pentagonhttp://en.wikipedia.org/wiki/Hexagonhttp://en.wikipedia.org/wiki/Euclidhttp://en.wikipedia.org/wiki/Concave_polygonhttp://en.wikipedia.org/wiki/Simple_polygonhttp://en.wikipedia.org/wiki/Complex_polygonhttp://en.wikipedia.org/wiki/Convex_polygonhttp://en.wikipedia.org/wiki/Concave_polygonhttp://en.wikipedia.org/wiki/Trapeziumhttp://en.wikipedia.org/w/index.php?title=In_British&action=edithttp://en.wikipedia.org/wiki/Trapezoidhttp://en.wikipedia.org/wiki/Trapeziumhttp://en.wikipedia.org/wiki/British_Englishhttp://en.wikipedia.org/wiki/Trapezoidhttp://en.wikipedia.org/wiki/Oppositehttp://en.wikipedia.org/wiki/Parallel_(geometry)http://en.wikipedia.org/wiki/Isosceles_trapeziumhttp://en.wikipedia.org/wiki/Isosceles_trapezoidhttp://en.wikipedia.org/wiki/Anglehttp://en.wikipedia.org/wiki/Parallelogramhttp://en.wikipedia.org/wiki/Kite_(geometry)http://en.wikipedia.org/wiki/Tessellationshttp://en.wikipedia.org/wiki/Rhombushttp://en.wikipedia.org/wiki/Rhomboidhttp://en.wikipedia.org/wiki/Obliquehttp://en.wikipedia.org/wiki/Rectanglehttp://en.wikipedia.org/wiki/Oblonghttp://en.wikipedia.org/wiki/Square_(geometry)http://en.wikipedia.org/wiki/Cyclic_quadrilateralhttp://en.wikipedia.org/wiki/Tangential_quadrilateralhttp://en.wikipedia.org/w/index.php?title=Bicentric_quadrilateral&action=edit
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    http://en.wikipedia.org/wiki/Image:Quadrilateral.pnghttp://en.wikipedia.org/w/index.php?title=Geometric_arrowhead&action=edithttp://en.wikipedia.org/wiki/Rectangle
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    http://en.wikipedia.org/wiki/Geometryhttp://en.wikipedia.org/wiki/Help:Pronunciationhttp://en.wikipedia.org/wiki/Plane_(mathematics)http://en.wikipedia.org/wiki/Figurehttp://en.wikipedia.org/wiki/Closed_curvehttp://en.wikipedia.org/wiki/Line_segmenthttp://en.wikipedia.org/wiki/Closed_polygonal_chainhttp://en.wikipedia.org/wiki/Polytopehttp://en.wikipedia.org/wiki/Polygon#Polygons_in_computer_graphicshttp://en.wikipedia.org/wiki/Polygon#naming_polygonshttp://en.wikipedia.org/wiki/Convex_polygonhttp://en.wikipedia.org/wiki/Simple_polygonhttp://en.wikipedia.org/wiki/Star-shaped_polygonhttp://en.wikipedia.org/wiki/Complex_polytopehttp://en.wikipedia.org/wiki/Complex_polytopehttp://en.wikipedia.org/wiki/Unitary_spacehttp://en.wikipedia.org/wiki/Complex_numberhttp://en.wikipedia.org/wiki/Star_polygonhttp://en.wikipedia.org/wiki/Equiangular_polygonhttp://en.wikipedia.org/wiki/Cyclic_polygonhttp://en.wikipedia.org/wiki/Circlehttp://en.wikipedia.org/wiki/Vertex-transitivehttp://en.wikipedia.org/wiki/Group_action#Orbits_and_stabilizershttp://en.wikipedia.org/wiki/Equilateralhttp://mathworld.wolfram.com/EquilateralPolygon.htmlhttp://en.wikipedia.org/wiki/Edge-transitivehttp://en.wikipedia.org/wiki/Group_action#Orbits_and_stabilizershttp://en.wikipedia.org/wiki/Regular_polygonhttp://en.wikipedia.org/wiki/Star_polygon
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    http://en.wikipedia.org/wiki/Rectilinear_polygonhttp://en.wikipedia.org/wiki/Monotone_polygonhttp://en.wikipedia.org/wiki/Euclidean_geometryhttp://en.wikipedia.org/wiki/Interior_anglehttp://en.wikipedia.org/wiki/Pihttp://en.wikipedia.org/wiki/Radianhttp://en.wikipedia.org/wiki/Degree_(angle)http://en.wikipedia.org/wiki/Exterior_anglehttp://en.wikipedia.org/wiki/Supplementary_anglehttp://en.wikipedia.org/wiki/Winding_numberhttp://en.wikipedia.org/wiki/Star_polygonhttp://en.wikipedia.org/wiki/Kepler-Poinsot_polyhedronhttp://en.wikipedia.org/wiki/Pentagramhttp://en.wikipedia.org/wiki/Orbit_(dynamics)
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    http://en.wikipedia.org/wiki/Image:LabeledPolygon.pnghttp://en.wikipedia.org/wiki/Image:LabeledPolygon.pnghttp://en.wikipedia.org/wiki/Areahttp://en.wikipedia.org/wiki/Simple_polygonhttp://en.wikipedia.org/wiki/Areahttp://en.wikipedia.org/wiki/Centroidhttp://en.wikipedia.org/wiki/Polygons#_note-0%23_note-0http://en.wikipedia.org/wiki/Absolute_valuehttp://en.wikipedia.org/wiki/Carl_Friedrich_Gausshttp://en.wikipedia.org/wiki/Green's_theoremhttp://en.wikipedia.org/wiki/Green's_theoremhttp://en.wikipedia.org/wiki/Area_(geometry)http://en.wikipedia.org/wiki/Simple_polygonhttp://en.wikipedia.org/wiki/Exterior_anglehttp://en.wikipedia.org/wiki/Polygons#_note-lopshits%23_note-lopshits
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    http://en.wikipedia.org/wiki/Pick's_theoremhttp://en.wikipedia.org/wiki/Bolyai-Gerwien_theoremhttp://en.wikipedia.org/wiki/Complex_polygonhttp://en.wikipedia.org/wiki/Degrees_of_freedom_(physics_and_chemistry)http://en.wikipedia.org/wiki/Shapehttp://en.wikipedia.org/wiki/Line_of_symmetry
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    http://en.wikipedia.org/wiki/Spherical_polygonhttp://en.wikipedia.org/wiki/Apeirogonhttp://en.wikipedia.org/wiki/Degeneracy_(mathematics)http://en.wikipedia.org/wiki/Degeneracy_(mathematics)http://en.wikipedia.org/wiki/Digonhttp://en.wikipedia.org/wiki/Apeirogonhttp://en.wikipedia.org/wiki/Dihedronhttp://en.wikipedia.org/wiki/Skew_polygonhttp://en.wikipedia.org/w/index.php?title=Petrie_polygon&action=edithttp://en.wikipedia.org/wiki/Spherical_polygonhttp://en.wikipedia.org/wiki/Apeirogonhttp://en.wikipedia.org/wiki/Complex_polytopehttp://en.wikipedia.org/wiki/Unitary_spacehttp://en.wikipedia.org/wiki/Latin_languagehttp://en.wikipedia.org/wiki/Greek_languagehttp://en.wikipedia.org/wiki/Greek_languagehttp://en.wikipedia.org/wiki/Numerical_prefixhttp://en.wikipedia.org/wiki/Pentagonhttp://en.wikipedia.org/wiki/Dodecagonhttp://en.wikipedia.org/wiki/Triangle_(geometry)http://en.wikipedia.org/wiki/Quadrilateralhttp://en.wikipedia.org/wiki/Nonagonhttp://en.wikipedia.org/wiki/Mathematicianhttp://en.wikipedia.org/wiki/Numeralhttp://en.wikipedia.org/wiki/Formula
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    http://en.wikipedia.org/wiki/Regularhttp://en.wikipedia.org/wiki/Star_polygonhttp://en.wikipedia.org/wiki/Pentagonhttp://en.wikipedia.org/wiki/Pentagramhttp://en.wikipedia.org/wiki/Henagonhttp://en.wikipedia.org/wiki/Digonhttp://en.wikipedia.org/wiki/Trianglehttp://en.wikipedia.org/wiki/Quadrilateralhttp://en.wikipedia.org/wiki/Pentagonhttp://en.wikipedia.org/wiki/Hexagonhttp://en.wikipedia.org/wiki/Heptagonhttp://en.wikipedia.org/wiki/Octagonhttp://en.wikipedia.org/wiki/Enneagonhttp://en.wikipedia.org/wiki/Decagonhttp://en.wikipedia.org/wiki/Hendecagonhttp://en.wikipedia.org/wiki/Dodecagon
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    http://en.wikipedia.org/wiki/Tridecagonhttp://en.wikipedia.org/wiki/Tetradecagonhttp://en.wikipedia.org/wiki/Pentadecagonhttp://en.wikipedia.org/wiki/Hexadecagonhttp://en.wikipedia.org/wiki/Heptadecagonhttp://en.wikipedia.org/wiki/Octadecagonhttp://en.wikipedia.org/wiki/Enneadecagonhttp://en.wikipedia.org/wiki/Icosagonhttp://en.wikipedia.org/wiki/Hectometrehttp://en.wikipedia.org/wiki/Chiliagonhttp://en.wikipedia.org/wiki/Myriagon
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    http://en.wikipedia.org/wiki/Honeycombhttp://en.wikipedia.org/wiki/Beehttp://en.wikipedia.org/wiki/Hexagonhttp://en.wikipedia.org/wiki/Starfishhttp://en.wikipedia.org/wiki/Pentagonhttp://en.wikipedia.org/wiki/Heptagonhttp://en.wikipedia.org/wiki/Echinodermhttp://en.wikipedia.org/wiki/Sea_urchinhttp://en.wikipedia.org/wiki/Symmetry_(biology)#Radial_symmetryhttp://en.wikipedia.org/wiki/Jellyfishhttp://en.wikipedia.org/wiki/Ctenophorehttp://en.wikipedia.org/wiki/Carambolahttp://en.wikipedia.org/wiki/Isaac_Newtonhttp://en.wikipedia.org/wiki/Lagrangian_pointhttp://en.wikipedia.org/wiki/Trojan_asteroidhttp://en.wikipedia.org/wiki/Tangramhttp://en.wikipedia.org/wiki/Tessellationhttp://en.wikipedia.org/wiki/Tessellationhttp://en.wikipedia.org/wiki/Polyhedronhttp://en.wikipedia.org/wiki/Infinite_skew_polyhedronhttp://en.wikipedia.org/wiki/Infinite_skew_polyhedron