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.
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.
There are 9 unit squares inside the given figure.
So, the area of the given figure is 9 square units.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.