Can someone help me with 11?

the perimeter equation in 2 times the length plus 2 times the height (2 x 8 + 2 x 6) which equals 12 + 16= 28, the area is length times width so 8 times 6 which equals 48
48 ft is the area; 28 ft is the perimeter
In this case, the height is being used as the width.
A = L x W
A = 8 x 6
A = 48
P = 2L + 2W
P = 2(8) + 2(6)
P = 16 + 12
P = 28
Answer: Area = 48 ft², Perimeter = 28 ft