This applies to any shape of the field, irregular or regular.
If you want to provide a fencing round the entire field you need its perimeter. If want to lay a pathway inside the field to keep a watch on your field you need its perimeter.
If you want to see how many crops can be grown, or how many apartments can be built, or how much tax you need to pay, you will need the area of the field.
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Answer:
Importance of perimeter and area:
This applies to any shape of the field, irregular or regular.
If you want to provide a fencing round the entire field you need its perimeter. If want to lay a pathway inside the field to keep a watch on your field you need its perimeter.
If you want to see how many crops can be grown, or how many apartments can be built, or how much tax you need to pay, you will need the area of the field.