The perimeter of a shape is the distance around the shape. It is calculated by adding together all the lengths of the sides of the shape.
For example, consider this shape:
Let's find its perimeter.
To find the perimeter, add the lengths of all the sides.
3 + 8 + 6 = 17
As the lengths are measured in kilometers, the perimeter is also measured in kilometers.
So, the perimeter of the given shape is 17 km.
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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.