To find the area of aa square multiply the length by the width.
In this case multiply 40 x 40 to get 1600.
The area of a square 40 inches x 40 inches is 1600 square inches.
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If you mean 10 inch per side, then the area = 10 x 10 = 100 square inches and the perimeter will be 4 x 10 = 40 inches.
9 x 13 = 117 square inches
= 6.14 Area of Circle - Area of Square r x Pi - side x side
Is the question What is the AREA of a 5 inch by 7 inch photograph? The area of the photograph is 5 x 7 = 35 square inches. But if you are asking how much surface area does a 5 inch by 7 inch photograph have, you have to consider the area of both the front and the back of the photograph or 70 square inches.
The answer depends on the units used for 3 X 8. It should, for example, be obvious that the number of square inches in a 3 inch x 8 inch shape will be different to the number of square inches in a 3 foot x 8 ft area.