Assuming this is a rectangular prism, the surface area would be 2LW+2LH+2HW. So the surface area for this object would be: 2*3*5+2*3*8+2*8*5=30+48+80=158 square meters.
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8m*5m=40 m2 The area of the rectangle is 40m2
If you mean an area measuring 3m x 8m, the answer is 22m !
It is 3 times 8 = 24 square m
Rectangles are really simple. The perimeter is twice the length plus twice the width (in this case 4m x 2 = 8m, 5m x 2 = 10m, and 8m + 10m = 18m). The area is simply the length times the width (in this case, 4m x 5m = 20m2).
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