150 feet!
39x2 (39+39) = 78
36x2 (36+36) = 72
72 + 78 = 150
We have to double the set of numbers to find the area of the classroom. This is because there is 4 sides, and 2 are going to be different from the other two, and vise versa.
4.9m questions
6.3m answers