If those are inches, the area is 143 square inches.
If you are talking about 11 by 13 inches the answer is 11x13=141.
If the given dimensions are in feet then 11*13 = 143 square feet
143. To arrive at square footage, you multiply the length in feet by the width in feet.
11ft x 13 ft = 143 square feet
11x13
320 square inches
1,296 square inches.
143
There are 144 square inches in a square foot. This calculates out to be 5,040 square inches.
10,656 square inches.
21,600 square inches.