Well first it would be 49x3 and that would equal the area so the area is 147. Next you would want to divide that by 4 because there is four sides of the mural, so 147 divided into 4 equals 36.75 square centimeters per side of the mural. The nearest tenth I believe would be 3.675.
So answer: 3.675 but I’m not sure so don’t get mad at me if I’m wrong lol