Area of Figures Formed with Complete Unit Squares

A unit square is a square having each side of length 1 unit. The area of a unit square is 1 square unit.

For example, consider the following figure made up of unit squares.

1 a

Let's find the area of this figure.

To find out the area of the given figure, we need to count the total number of unit squares.
 

1 b
 

There are 9 unit squares inside the given figure.
 

So, the area of the given figure is 9 square units.
ds

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Help

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.