Math Glossary, Math Terms, A

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• Abacus in Various Number Systems
• Abelian group
• Absissa
• Absolute Geometry
• Absolute value
• Absolute value of a complex number
• Absorbtion identity
• Abundant Number
• Acute angle
• Acute triangle
• Adams' Circle
• Adams' Method of Apportionment
• Addition
• Addition Formula for Sine
• Additive Inverse
• Additivity
• Adjacency
• Affine Geometry
• Affine Space
• Affine Transformation
• Affirmative Action Problem
• Alabama Paradox
• Alexander the Great
• Algebraic numbers
• Algorithm
• Aliquot part
• All Triangles Are Isosceles
• Alternate Angle
• Alternating group
• Altitude
• An Airline Problem
• Anallagmatic
• Analog gadgets
• Angle
• Angle Bisectors
• Angle of incidence
• Angle of reflection
• Angle preservation property
• Angle Trisection
• Angular distance
• Annulus
• An Old Japanese Theorem
• Anticenter of a Quadrilateral
• Antichain
• Antichain in lexicographic order
• Anticommutativity
  • Anticommutative quasigroup
• Anticomplementary Triangle
  • Anticomplementary Triangle
• Antiequilic Quadrilateral
• Antihomologous
• Antiparallel
  • Antiparallel
• Antipedal triangle
• Antisymmetry
• Apollonian Gasket
• Apollonian Circles
• Apollonian Circles Theorem
  • Apollonian Circles Theorem
• Apollonian Family of Circles
• Apollonius Problem
• Apollonius' Theorem
• Apportionment Problem
• Arbelos
• Arc (in circle)
• Archimedes of Syracuse
• Archimedes Triangle
• Archimedes' Lemma
• Archimedes' Method
• Archimedes' spiral
• Archimedes' Squaring of Parabola
• Archimedes' Twin Circles
• Area of a Parallelogram
• Area of a Ring
• Areal Coordinates
• Argand Diagram
• Argument of a Complex Number
• Arithmetic mean
  • Arithmetic-Geometric Mean Inequality
• Arithmetic Operations in Various Bases
• Arithmetic Paradoxes
• Arithmetic Series
• Articulation (node) of a graph
• ASA
• Assimilation Illusion
• Associativity
  • Associativity
• Associates
• Astroid
  • Astroid
• Asymmetric Propeller
  • Napoleon's Propeller
• Asymmetry
• Attractive Point
• Automaton
• Automorphism
• Axiom of Choice
• Axiomatic Completeness
• Axis of Homothety
• Axis of Symmetry of a Conic