Perimeter of Squares and Rectangles

The perimeter is calculated by adding together all the lengths of the sides of the shape.

 

3

 

Perimeter of a rectangle = length + width + length + width

                                        = 2 × (length + width)

 

 

2

 

Perimeter of a square = side + side + side + side

                                    = 4 × side





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The correct answer is

Remember :

The smallest number is the one that comes first while counting.

Solution :

To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.

21,27,23

21 is the smallest number.