Math Dictionary-A

Math Dictionary-A deals with math words starting with the alphabet 'A'.

AAA Similarity test

This is one of the three ways to test that two triangles are similar.
"Two triangles are said to be similar if the measure of three interior angles in one triangle are the same as the corresponding angles in another.

AAS congruence

This is one of the way to test the congruency of the triangles. It states that, "Two triangles are said to be congruent, if two adjacent angles, and a side of one triangle are congruent with the corresponding angles and side of the other triangle."

ASA congruence

This is one of the way to test the congruency of two triangles. It states that, "If two angles in one triangle are congruence with the corresponding angles in the other triangle, and also if the included sides are congruent, then the two triangles are said to be congruent".


Abacus is a counting tool used for early learners of math. It is also called as adding machine. It is a belief that this adding machine was used by early Aztecs in 300 BC.

Absolute value

The absolute value of a number is its distance from 0 on a number line. For example, the number "9" is 9 units away from zero. So its absolute value is 9.

Acute angle

The angle which is less than 90 degree is called Acute angle.30 degree, 45 degree and 75 degree are some examples of acute angle.


Numbers involved in addition are called addend.

Adjacent angles

Refers to a pair of angles, that share a common vertex and side did not overlap. When referring to polygons, two interior angles that share a common side are also called as adjacent angles. It can also be called as adjacent interior angles of the polygon.

Math dictionary-a also deals with the following words.


In matrix adjoint refers to the transpose of co factor of the given matrix. It is denoted as adjA for a matrix A.


A branch of math in which we use letters in the place of unknown values. To know more about algebra, you can go through this page Algebra


Explains how to solve a problem step by step instructions.


The first alphabet of ancient Greece which is used in math and science.

Alternate exterior angles

In the following figure the angles 1 and 3 and 2 and 4 are called as alternate exterior angles.

Alternate interior angles

In the following diagram the exterior angles 1 and 2 and 3 and 4 represents alternate exterior angles.

Alternating sequence:

                 In alternating sequence, the alternate term changes signs.


     -1, 2, -3, 4, -5, 6, -8, ........


Height of an object above sea level. Dictionary-a

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