# The Cardinal number of the set A = {quadrilateral with 5 sides} is

A) 1

B) 0

C) 2

D) 4

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**Hint:**Try to find the number of elements in the set A satisfying the condition of quadrilateral, then find the cardinal number. Cardinal number is the number of distinct elements in a finite set.

**Complete step by step solution:**Since, we have the sides of a quadrilateral as the element of set A.

We know that a quadrilateral consists of four sides and a quadrilateral of five sides never exist. Since, the set A has no solution. Hence, it is an empty set.

A$=\{\ \}$

Cardinal number of A

$=n(A)$

Since there are no elements the Cardinal no 0.

**The correct answer is option B.**

**Note:**In mathematics a set is defined as a collection of distinct elements. Additionally, you should know the names of each polygon with a different number of edges. For example, in this question ‘quad’ from the word quadrilateral means four i.e. a polygon with four sides.