You would have to measure the walls of the classroom, adding them together to find the perimeter, then if the classroom is square or rectangular multiply two adjoining sides to find the area
Perimeter First you would have to know the length of all of the sides so then you add up all of the numbers and that is the answer
Area First you would have to find the length and width of the room and then you have to multiply and then that is the answer to find the area of the classroom. hope this helps you a lot.
