Abacus

Absolute Error

Absolute Value Function

Absolute Value of a Real Number

Absorbing Element

Abundant Number

Acre

Acute Angle

Acute Triangle

Ada Lovelace (1815-1852)

Adding Fractions

Adding Functions

Adding Matrices

Adding Vectors

Addition

Addition Equation

Addition Of Irrational Numbers

Addition of Rational Numbers

Addition of Real Numbers

Additive Inverse

Adjacent

Adjacent Angles

Adjacent Faces

Adjacent Sides

Adjacent Vertices

Affine Function

Algebra

Algebraic Equation

Algebraic Expression

Algebraic Function

Algebraic Identity

Algebraic Measure

Algebraic Number

Algebraic Operation

Algebraic Structure

Algebraic Sum

Algorithm

Aliquant Part of an Integer

Aliquot Part of a Whole

Alphabetical Order Number

Alphametic

Alternate Angles

Alternate Exterior Angles

Alternate Interior Angles

Amalie Emmy Noether (1882-1935)

Amicable Numbers

Amortization

Amplitude

Amplitude of a Periodic Function

Amplitude of a Sinusoidal Function

Amplitude of a Statistical Class

Amplitude of an Interval

Angle

Angle Bisector

Angle in a Plane

Angle of Depression

Angle of Elevation

Angle Of Rotation

Angular Sector

Annuities

Annulus

Antecedent

Anti-Reflexive Relation

Antisymmetric Relation

Antitransitive Relation

Apex

Apothem of a Regular Polygon

Application

Approximate Value

Approximation

Approximation by Estimation

Approximation by Rounding

Approximation by Truncation

Arabic Numeral

Arc

Arc Cosecant

Arc Cosine

Arc Cotangent

Arc of a Graph

Arc Secant

Arc Sine

Arc Tangent

Archimedean Solid

Archimedes of Syracuse (c. 287- c. 212 BCE)

Are

Area

Area of a Circle

Area of a Polygon

Argument

Arithmetic

Arithmetic Function

Arithmetic Mean

Arithmetic Progression

Arithmetic Sequence

Arrangement

Arrow Diagram

Aryabhata (476 – 550)

As Much

Ascending

Ascending Order