360 square feet. This is an easy calculation - just multiply the length in feet by the width in feet. The answer is the number of square feet.
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Assuming that 12 x 12 is 12" x 12" (one square foot), then 30 one-square-foot tiles would cover 30 square feet.
360 square feet
3 x 30 = 90 square feet. 1 square foot = 144 square inches (12 x 12) So 90 square feet = 12,960 square inches
30 feet x 12 feet is 52 square yards 30 yards x 12 yards is 468 square yards
Broken down as follows: 30 feet = 10 yards 36 feet = 12 yards 10 x 12 = 120 square yards