This question has no possible answer.
Only circles have diameters.
Rectangles have "length" and "width".
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Surface area of rectangle: 15 times 8 = 120 square inches
28 inches
Width of the rectangle: 33.6/8 = 4.2 inches
12
A cylinder with a height of 10 inches and a diameter of 8 inches has a surface area of 351.86 square inches.