Zero - 7 feet 8 inches is a linear measurement (length of a line), while square meters are used to measure area (like, uh, squares).
If you mean 7 square feet, 8 square inches, you can estimate this fairly easily - one meter is about 3.3 feet, so one square meter is about 3.3 * 3.3 = 10.89 square feet. So 7 square feet, 8 square inches (using a square inch = 1/144 of a square foot) would be 7 + 8/144 square feet, or 7.056 square feet. Divide this by 10.89 square feet per meter, and you get 7.056 / 10.89 = about 0.65 square meters.
If you mean a square that's 7 feet 8 inches by 7 feet 8 inches, on the other hand, that's about 58.83 square feet, or about 5.4 square meters.
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The result is 15 (14.9767) square meters.
20.9032 square meters.
13 feet 6 inches x 14 feet equates to an area of about 17.56 square meters.
A room that measures 9 feet 3 inches by 5 feet 2 inches has an area of 4.44 square meters.
39.01821 square meters