# A

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Abacus

Abscissa

Abelian Group

Absolute Error

Absolute Maximum

Absolute Minimum

Absolute Value

Absolute Value Rules

Abundant Number

Acceleration

Accuracy

Acute Angle

Acute Triangle

Addend

Adding using number line (whole numbers)

Adding using regrouping (whole numbers)

Addition

Addition (complex numbers)

Addition (decimals)

Addition (fractions)

Addition (integers)

Addition (rational numbers)

Addition (real numbers)

Addition (vectors)

Addition (whole numbers)

Addition combinations (whole number)

Addition formulas (trigonometry)

Additive Identity

Additive Inverse

Additive Inverse of a Matrix

Additive Inverse of a Number

Additive Property of Equality

Adjacent

Adjacent Angles

Affine cipher

After concept (numbers)

Aleph Null

Algebra

Algebraic Equation

Algebraic Expression

Algorithm

Alpha

Alphametic

Alternate Angles

Alternate Exterior Angles

Alternate Interior Angles

Alternating Series

Altitude

Altitude (polyhedrons)

Altitude (triangle)

Amicable Numbers

Amortization

Amplitude

Analytic Geometry

Analytic Methods

Angle

Angle Bisector

Angle of Depression

Angle of Elevation

Angle of Inclination of a Line

Angular Acceleration

Angular Velocity

Annulus

Antecedent

Anticlockwise

Antiderivative

Antiderivative of a Function

Antilogarithm

Antipodal Points

Apex

Apothem

Approximation (real numbers)

Approximation (measurement)

Approximation (area )

Arc

Arc Lenght of a Curve

Arc of a Circle

Arccosecant

Arccosine

Arccotangent

Arcsecant

Arcsine

Arctangent

Area

Area (quadrilateral)

Area of region

Area of triangle

Area Between Curves

Area Under a Curve

Argument

Argument of a Function

Argument of a Vector

Arithmetic

Arithmetic Mean

Arithmetic Progression

Arithmetic Sequence

Arithmetic Series

Arm of an Angle

Array

ASA Congruence

Associative Property of Addition

Associative Property of Multiplication

Asymptote

Average

Average Expected Payoff

Average Rate of Change

Axiom

Axiom of Probability

Axis of Symmetry