Perimeter of a Square:

To find the perimeter of a square, we need to add up all the sides of the square. Since a square has four equal sides, we can simply multiply the length of one side by 4 to get the perimeter.

Given that the side of the square is 5 cm, we can calculate the perimeter as follows:

Perimeter = 4 * Side Length

Calculations:

Perimeter = 4 * 5 cm
Perimeter = 20 cm

So, the perimeter of the square is 20 cm.

Detailed Explanation:

A square is a four-sided polygon with all sides equal in length. Each side of a square is perpendicular to the adjacent side, and all interior angles are right angles (90 degrees).

The perimeter of a shape is the sum of the lengths of all its sides. In the case of a square, since all sides are equal, we can find the perimeter by multiplying the length of one side by 4.

In this question, the given side length of the square is 5 cm. By substituting this value into the formula, we can calculate the perimeter.

Perimeter = 4 * Side Length
Perimeter = 4 * 5 cm
Perimeter = 20 cm

Therefore, the perimeter of the square with a side length of 5 cm is 20 cm.

Conclusion:

The correct answer is option 'A', which states that the perimeter of the square is 20 cm.