Category: Math Dictionary For Kids

The area between two concentric circles.

Annual is typically used to describe something that happens once a year. Circannual describes events that take place over the course of one year and repeat year after year.

Adjacent is an adjective meaning contiguous, adjoining or abutting.
In geometry, adjacent sides of a polygon meet at a vertex and adjacent vertices of a polygon are joined by a side.
In trigonometry the adjacent side of a right angled triangle is …

Addition is the mathematical operation of combining or adding two numbers to obtain an equal simple amount or total. Addition also provides a model for related processes such as joining two collections …

Two or more numbers which are added. 

Example  

      4    +          …

Join two or more numbers, or quantities together 

3 + 5 = 8 

In geometry and trigonometry, an angle (in full, plane angle) is the figure formed by two rays sharing a common endpoint, called the vertex of the angle. The magnitude of the …

Exact, correct, right, careful, with no error.

State of being exact or accurate.

An abacus (plurals abacuses or abaci), also called a counting frame, is a calculating tool for performing arithmetical processes, often constructed as a wooden frame with beads sliding on wires. The user, called an abacist, …