Abacus
Abscissa
Absolute Value
Acceleration
Accuracy
Acre
Acute Angle
Acute Triangle
Add
Addend
Addition
Additive Identity
Additive Inverse
Adjacent
Adjacent Angles
Algebra
Algorithm
Alternate Exterior Angles
Alternate Interior Angles
Altitude
Altitude (Geometry)
AM
Amplitude
Analog
Analog Clock or Watch
Angle
Angle Bisector
Angle of Depression
Angle of Elevation
Annual
Annual Percentage Rate (APR)
Annual Percentage Yield (APY)
Annulus
Anticlockwise
Apex
Apothem
Approximation
Arc
Arc Length
Area
Argument
Arithmetic
Arithmetic Sequence
Arm of an Angle
Array
Ascending Order
Asset
Associative Law
Asymmetry
Asymptote
Attribute
Autumn
Average
Axes
Axis (geometry)
Axis (graph)
Axis of Symmetry
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