Perimeters And Area

I've been learning how to find the perimeter and area of a shape. At first I really found it hard but then I started to get the hang of it and I enjoyed doing it. Finding the area and perimeter is help full because if you were designing a room you would need to know how big the room is before you start designing to fit everything in. Hope you learning something from this. How do you think area and perimeter might help you?