Century/Closed Figure/Closure

CENTURYA period of one hundred years.

CLOSED FIGUREA geometric figure that entirely encloses part of the plane.

CLOSUREA property of a set of numbers such that the operation with two or more numbers of that set results in a number of the set. Example: In addition and multiplication with counting numbers, the results is a counting numbers. 2 + 4 = 6; 2 x 4 = 8

Thus, the counting numbers are closed under  these two operations.

In subtraction, if 4 is subtracted from 2, the result (-2) is not a counting number. Also in dividing a 2 by 4, the results (1/2) is not a counting  number. Thus, the counting numbers are not  closed with respect to subtraction and division.

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