Since the total perimeter is 28cm and it’s height and length have a difference of 2 the length has to be 6 and it’s length must be 8. To get the area of a rectangle you multiply the length times it’s width; 6 times 8 which equals 48.
I think the part he has correct is when they are equal because they intersect at a coordinate, but, he is incorrect because the teacher's expression could be different
