If they are 12 inches x 12 inches then you would need 399 tiles.
21 feet times 19 feet = 399 square feet
21*19 = 399 square feet.
The answer depends on the units used for 21x19: inches, metres, kilometres? Since that information has not been provided it is not possible to answer the question sensibly.
Circumference of circle in inches: 108*pi = 399 inches to the nearest whole number
If they are 12 inches x 12 inches then you would need 399 tiles.
21 feet times 19 feet = 399 square feet
399 mm is 15.71 inches.
21*19 = 399 square feet.
The answer depends on the units used for 21x19: inches, metres, kilometres? Since that information has not been provided it is not possible to answer the question sensibly.
399
399 cubic miles = 5.87319828 × 1013 cubic feet
Circumference of circle in inches: 108*pi = 399 inches to the nearest whole number
399 ft.
133 yards.
399 square yards is 333.61 square meters.
Lexington, Kentucky's area is 285.52 square miles.