30 feet by 28 feet equals 840 square feet. 30 inches by 28 inches equals 840 square inches, or 5.833 square feet.
864 square inches
35 square feet.
2.127 square feet.
9 square feet = 1,296 square inches.
864 square inches.
221.76 square inches.
500 square inches is 3.47 square feet.
288 square inches.
1.77 square feet.
9.618 square feet.
15 square feet.